No root = no custom recovery? - Verizon Galaxy Note 4 Q&A, Help & Troubleshooting

After several pages of reading i need to ask this:
I have a n910v that is a CDMA phone and i need to use it in a GSM network. For this i found that there is a way to reach that trough a "script". In order to run that i need to set the "signature verificatio" off. (I'm ok with that, i trust the script developer), but for doing that i need a custom recovery (right?) and to have a custom recovery instaled i need to rooot the phone (as far as i understand), so: since there is no root for this sm-n910v there is also no custom recovery?
Thanks!

just64 said:
After several pages of reading i need to ask this:
I have a n910v that is a CDMA phone and i need to use it in a GSM network. For this i found that there is a way to reach that trough a "script". In order to run that i need to set the "signature verificatio" off. (I'm ok with that, i trust the script developer), but for doing that i need a custom recovery (right?) and to have a custom recovery instaled i need to rooot the phone (as far as i understand), so: since there is no root for this sm-n910v there is also no custom recovery?
Thanks!
Click to expand...
Click to collapse
For a custom recovery you need a unlocked bootloader witch the retail Note 4 dose not have. Root can be achieved without a bootloader unlock but a unlock allows the custom recovery without having root thus making it much easier to root.

Misterxtc said:
For a custom recovery you need a unlocked bootloader witch the retail Note 4 dose not have. Root can be achieved without a bootloader unlock but a unlock allows the custom recovery without having root thus making it much easier to root.
Click to expand...
Click to collapse
Hmmm, so you are saying me that i need a bootloader unclock?

Not sure why you need to do anything of the sort? I am using 2 Verizon note 4's here in Ireland on GSM my wife and I. I did find when I received them they would not work with a GSM sim or connect to a GSM Network here in Ireland. So I went on ebay and bought a Verizon sim card, dummy/dead/unactivated what ever for 5 dollars poped it in to both phones, they said activating phone then activation failed. But guess what GSM sim card worked after that....its a strange one.
By the way it needs to be a 4G Verizon sim card. I tried another Verizon Sim and it didn't work.
Hope this helps

gersrt said:
Not sure why you need to do anything of the sort? I am using 2 Verizon note 4's here in Ireland on GSM my wife and I. I did find when I received them they would not work with a GSM sim or connect to a GSM Network here in Ireland. So I went on ebay and bought a Verizon sim card, dummy/dead/unactivated what ever for 5 dollars poped it in to both phones, they said activating phone then activation failed. But guess what GSM sim card worked after that....its a strange one.
By the way it needs to be a 4G Verizon sim card. I tried another Verizon Sim and it didn't work.
Hope this helps
Click to expand...
Click to collapse
Well, i'm in Argentina, to have a Verizon SIM card here is going to take about 4/5 weeks, but is good to know, thanks.
Btw, ur Note 4 was also a CDMA phone?

Yes it is a cdma. Took about 2 weeks for me to get Sim. Make sure it's a 4G one you buy. It's well worth the wait. Best of luck.

just64 said:
Hmmm, so you are saying me that i need a bootloader unclock?
Click to expand...
Click to collapse
For a custom recovery yes,for a carrier unlock no. These are two entirely different unlocks. As gersrt said you need a different sim card. The phone should already be carrier unlocked.

Related

[Q] T889 back to stock

I bought the T889 on release to unlock and use on straight talk, with the straight talk AT&T micro sim. (I'm not cutting down a straight talk T-mobile sim) I rooted my phone using these steps. (galaxynote2root.com/galaxy-note-2-root/how-to-root-galaxy-note-2-easiest-method/) ((I'm too new to post links)) The phone rooted like a charm. I tried a sim unlock app that needed root to use, but apparently the app only works with certain chipsets. Contacted support for the sim unlock app and they told me I'd have to pay a service to unlock the phone for me. T-mobile only gives you the unlock if you've been a customer for over 60 days. Playing with the CWM I was able to unroot the phone. I am unable to figure out how to get rid of CWM to have the phone get OTA updates. Any assistance would be greatly appreciated. Mr. or Mrs. moderator, I apologize if i put this in the wrong place, I'm new to the forum scene.
This is interesting.
Does this mean I can take my note 2 and unlock it, then give it to my cousin on at&t and she can use Lte?
konceptz said:
This is interesting.
Does this mean I can take my note 2 and unlock it, then give it to my cousin on at&t and she can use Lte?
Click to expand...
Click to collapse
my understanding is that the t-mobile version was made with LTE locked, but I'm clearly not an expert. I've read that the phone includes the radio to pick up LTE bands, but that you would have to do something to unlock the feature. However, the phone should work exactly the same as it would on T-mobile, with no other changes, aside from unlocking the sim.
bigg6987 said:
my understanding is that the t-mobile version was made with LTE locked, but I'm clearly not an expert. I've read that the phone includes the radio to pick up LTE bands, but that you would have to do something to unlock the feature. However, the phone should work exactly the same as it would on T-mobile, with no other changes, aside from unlocking the sim.
Click to expand...
Click to collapse
It does have a radio for the LTE bands. It is locked upon purchase. I am not certain, but perharps using the USSD codes to get into radio choices may be simple enough... but I am by no means an expert. Try *#*#4636#*#* to change cellular radios
bigg6987 said:
I bought the T889 on release to unlock and use on straight talk, with the straight talk AT&T micro sim. (I'm not cutting down a straight talk T-mobile sim) I rooted my phone using these steps. (galaxynote2root.com/galaxy-note-2-root/how-to-root-galaxy-note-2-easiest-method/) ((I'm too new to post links)) The phone rooted like a charm. I tried a sim unlock app that needed root to use, but apparently the app only works with certain chipsets. Contacted support for the sim unlock app and they told me I'd have to pay a service to unlock the phone for me. T-mobile only gives you the unlock if you've been a customer for over 60 days. Playing with the CWM I was able to unroot the phone. I am unable to figure out how to get rid of CWM to have the phone get OTA updates. Any assistance would be greatly appreciated. Mr. or Mrs. moderator, I apologize if i put this in the wrong place, I'm new to the forum scene.
Click to expand...
Click to collapse
You can flash Chainfire's CF-Auto-Root. It installs SuperSU and stock recovery. Then you can just use the Superuser app to unroot.
http://forum.xda-developers.com/showpost.php?p=33390392&postcount=1
Everything I've read implies it would take a serious firmware update to enable LTE, so I don't think I'd count on a solution soon. That sure would be cool though.

[Q] Sim unlock HTC Desire HD

Hi,
Need a quick simple yes no answer. My phone has been rooted and on a custom ROM - can I sim unlock my phone for FREE?
Yes
Sent from my HTC Desire HD using Tapatalk 2
DavidDHD said:
Hi,
Need a quick simple yes no answer. My phone has been rooted and on a custom ROM - can I sim unlock my phone for FREE?
Click to expand...
Click to collapse
If you are S-OFF (not rooted but S-OFF) then your phone is problably sim unlocked. Take into consideration that not all sim unlocked devices work with all carrier sims. Some carriers lock their sims so they can not work with unlocked devices.
If you used the Hack Kit to root your device, then you are simunlocked. Check it this way: http://forum.xda-developers.com/wiki/HTC_Vision#Rooting_the_Vision_.28G2.2FDZ.29_and_DHD
Paragraph 5.
glevitan said:
If you are S-OFF (not rooted but S-OFF) then your phone is problably sim unlocked. Take into consideration that not all sim unlocked devices work with all carrier sims. Some carriers lock their sims so they can not work with unlocked devices.
If you used the Hack Kit to root your device, then you are simunlocked. Check it this way: http://forum.xda-developers.com/wiki/HTC_Vision#Rooting_the_Vision_.28G2.2FDZ.29_and_DHD
Paragraph 5.
Click to expand...
Click to collapse
I used the Ace hack tool kit which rooted and S-OFF'd my device. Tried a Giffgaff sim and it never worked.
DavidDHD said:
I used the Ace hack tool kit which rooted and S-OFF'd my device. Tried a Giffgaff sim and it never worked.
Click to expand...
Click to collapse
Then it is what I said....not all simlocked work with all carriers. I have unlocked mine that way and works here in Buenos Aires...
glevitan said:
Then it is what I said....not all simlocked work with all carriers. I have unlocked mine that way and works here in Buenos Aires...
Click to expand...
Click to collapse
I just tried another one after purchasing an unlocking code and the SIM works. How retarded of me. So is it just some SIM cards that wont work or is it generally all sim cards from a specific carrier?
DavidDHD said:
I just tried another one after purchasing an unlocking code and the SIM works. How retarded of me. So is it just some SIM cards that wont work or is it generally all sim cards from a specific carrier?
Click to expand...
Click to collapse
Seems that GIFFGAFF locks the sims...so you probably will have to ask them for a new one.
Yes.
Yes it can be unlocked but not free. You have to get your unlock code provided by your network service provider, for that you have to pay a little bucks. To get the unlock code you can go to Unlock-Zone.com and select your country and network to which your phone is locked. And get your unlock code through mail.If you try with free codes there are many possibilities for your phone to be hard locked.

Unlock Code From AT&T Not Working - What Can I Do? [HELP]

I was given the unlock code and it still says request to unlock network unsuccessful, it's eligible to be unlocked...
All help would be greatly appreciated.
Should I try flashing over back to this stock rom and then see: http://server10.stockroms.net/download/GalaxyNote2/SGH-I317/I317UCALJ2_I317ATTALJ2_ATT.zip
I hate being stuck in a rut like this, already had my account transfered to a T-Mobile microsim. This is driving me nuts...
The person I bought this phone from said they updated but then when I checked it was still at 4.1.2 and said something about update interrupted...
Or which of these should I use: http://www.scottsroms.com/downloads.php?do=cat&id=71
Flashing a Rom won't unlocknyour phone..... Also what do you mean your still on 4.1.2?? That is the latest Rom for the phone. ... Where are you obtaining your unlock code from? The only time att provides it themselves is over the phone. You sure your not getting the wrong code?
Sent from my Xperia X10 using xda app-developers app
Yes I got the code from AT&T over the phone, called them twice and got the same code 1-800-331-0500 they gave me 41907314... According to this: http://galaxynote2root.com/galaxy-note-2-tutorials/how-to-unlock-sim-for-free-on-gsm-galaxy-note-2/ if ya take the newest update, ya can't sim unlock the phone cause it takes out the “NW Lock NV Data Initiallize” (Step #9) according to YouTube user comments...
THIS IS WHY I'm wondering what Stock firmware I need to downgrade back to in order to get that option again and be able to sim unlock my phone.
So I'm wondering if it's I317UCALJ2 or I317UCALK7 that re-enables that option for me. Right now I'm on I317UCAMA4...
_
Sorry bout the 2 posts, I thought it'd auto-append them to my main post...
Okay now I keep getting errors on installing about a signature and then two file locations sdCard0 and I think extsdCard...
How can I fix this do I copy the image to sdCard (InnerSD)? Or do I need CWM to install for Scott's Stock ROMs?
Yup that worked, I had to use Odin and this image http://server10.stockroms.net/download/GalaxyNote2/SGH-I317/I317UCALJ2_I317ATTALJ2_ATT.zip and followed these instructions on installing it: http://androidromupdate.com/2012/11...y-note-2-sgh-i317-original-factory-stock-rom/ then unlocked it with the directions galaxynote2root.com had listed...
n1nj4Lo said:
Yup that worked, I had to use Odin and this image http://server10.stockroms.net/download/GalaxyNote2/SGH-I317/I317UCALJ2_I317ATTALJ2_ATT.zip and followed these instructions on installing it: http://androidromupdate.com/2012/11...y-note-2-sgh-i317-original-factory-stock-rom/ then unlocked it with the directions galaxynote2root.com had listed...
Click to expand...
Click to collapse
hi
I am having the same issue, I got unlock code from ATT but it says network unlock request unsuccessful.
so if I follow above instruction to go back to 4.1.1 I will be able to use the unlock code right?
can you please give me few steps which you used for unlocking... then unlocked it with the directions galaxynote2root.com had listed.<--I dont find it.
I will try to flash it.
and after unlock can we do factory update 4.1.2?
smithjohnatpa said:
hi
I am having the same issue, I got unlock code from ATT but it says network unlock request unsuccessful.
so if I follow above instruction to go back to 4.1.1 I will be able to use the unlock code right?
can you please give me few steps which you used for unlocking... then unlocked it with the directions galaxynote2root.com had listed.<--I dont find it.
I will try to flash it.
and after unlock can we do factory update 4.1.2?
Click to expand...
Click to collapse
You can try the ^^^^^^ links do you can enter your code in too get it unlocked!
Or try this if still not working
http://forum.xda-developers.com/showthread.php?p=34661189
Sent from my SAMSUNG-SGH-I317 using Xparent SkyBlue Tapatalk 2
Yea after all that it's safe to upgrade back to 4.1.2 or 4.2.2 or nearly any compatible rom you like.
n1nj4Lo said:
Yea after all that it's safe to upgrade back to 4.1.2 or 4.2.2 or nearly any compatible rom you like.
Click to expand...
Click to collapse
Thanks downloading now...
does it matter which SIM I have to put inside? mine is ATT do I have to keep ATT sim inside or Tmobile will work too?
smithjohnatpa said:
Thanks downloading now...
does it matter which SIM I have to put inside? mine is ATT do I have to keep ATT sim inside or Tmobile will work too?
Click to expand...
Click to collapse
Ya might wanna keep the T-Mobile sim in it just to make sure it unlocked it correctly...
n1nj4Lo said:
Ya might wanna keep the T-Mobile sim in it just to make sure it unlocked it correctly...
Click to expand...
Click to collapse
No I mean while doing this process? Odin thing.. does it matter which SIM I have to keep in note
This http://galaxynote2root.com/galaxy-note-2-tutorials/how-to-unlock-sim-for-free-on-gsm-galaxy-note-2/ is the tute I believe, gotta remember it's been 2 months since I did this, so I'm not quite 100% certain. LoL
I'll be having to do it all over again too, by the end of this week possibly, since some jerk decided to steal my note 2 I had to go to ebay and win a new one.
I don't think it'd matter during the Odin flash with a AT&T sim card or T-Mobile one in it, I can't remember if I did it with or without a sim card, but to be on the safe side I'd do it without a T-Mobile sim card in it, just for that first successful boot... Then do the 4.1.1 unlock code method, take the back and battery off then pop in the T-Mobile sim card(Or whatever other non-AT&T carrier sim card) and see if it done it correctly...
n1nj4Lo said:
This http://galaxynote2root.com/galaxy-note-2-tutorials/how-to-unlock-sim-for-free-on-gsm-galaxy-note-2/ is the tute I believe, gotta remember it's been 2 months since I did this, so I'm not quite 100% certain. LoL
I'll be having to do it all over again too, by the end of this week possibly, since some jerk decided to steal my note 2 I had to go to ebay and win a new one.
I don't think it'd matter during the Odin flash with a AT&T sim card or T-Mobile one in it, I can't remember if I did it with or without a sim card, but to be on the safe side I'd do it without a T-Mobile sim card in it, just for that first successful boot... Then do the 4.1.1 unlock code method, take the back and battery off then pop in the T-Mobile sim card(Or whatever other non-AT&T carrier sim card) and see if it done it correctly...
Click to expand...
Click to collapse
Thanks a lot you been real good help for me to unlock my note 2.
yes worked with TMOBILE Sim to so seems like doesnt matter.
and now i updated 4.1.2 with Kies and it worked fine too and my phone is unlock now taking tmobile SIM too.
appreciate it.
so sorry your phone stolen.
help
hi, i'm new here. i don't know anything about phones. i just switched from at&t to tmobile. i'm using the galaxy note 2 (at&t). with a t-mobile sim card. i got the unlock code from at&t and it is not working. it tells me the unlock network is "unsuccessful" and i've already tried it like 6 times. i'm only aloud 10 attempts. can someone please help me? i know this forum is mostly how to unlock the phone manually, like without the unlock code number.. but i have the code, i just want it to work.. i don't want to root or flash or whatever. i don't even know what that means. can someone please help me?
Try this
galxynote2 said:
hi, i'm new here. i don't know anything about phones. i just switched from at&t to tmobile. i'm using the galaxy note 2 (at&t). with a t-mobile sim card. i got the unlock code from at&t and it is not working. it tells me the unlock network is "unsuccessful" and i've already tried it like 6 times. i'm only aloud 10 attempts. can someone please help me? i know this forum is mostly how to unlock the phone manually, like without the unlock code number.. but i have the code, i just want it to work.. i don't want to root or flash or whatever. i don't even know what that means. can someone please help me?
Click to expand...
Click to collapse
I bought an AT&T live demo note 2 that was used in an AT&T store. I used this method from youtube, popped in my niece's T-Mobile microsd and dialed 611. T-Mobile's customer service rang and answered showing it worked. You need 4.1.1 to use this method though. I'm going get me a microsim today since my vibrant doesn't use the micro.
FREE HOW TO UNLOCK SAMSUNG GALAXY NOTE 2
You do not really need the unlock code. Do a search in the forum as you cam just unlock it with Samsung' service menu.
Sent from my SAMSUNG-SGH-I317 using Tapatalk
PUTALE said:
You do not really need the unlock code. Do a search in the forum as you cam just unlock it with Samsung' service menu.
Sent from my SAMSUNG-SGH-I317 using Tapatalk
Click to expand...
Click to collapse
The link I posted above shows the step by step instructions on YouTube.
this is NOT TRUE if on 4.3.x
PUTALE said:
You do not really need the unlock code. Do a search in the forum as you cam just unlock it with Samsung' service menu.
Sent from my SAMSUNG-SGH-I317 using Tapatalk
Click to expand...
Click to collapse
The above is not true - if your phone has upgraded firmware, you will NOT see the item "NW LOCK NV RAM...." in your "NETWORK LOCK" "PHONE CONTROL" menu.
So, the ONLY two solutions are:
1) keep bugging ATT to create a case for you and investigate
2) downgrade to 4.1.1 modem (NEED TO READ/UNDERSTAND HOW TO FLASH etc.)
then apply the Samsung service menu "fix" as shown in the above video...*
*Then, you could upgrade to newer ROM... if you wish....:cyclops:

How to Sim unlock HTC ONE M8?

**I'm an amateur at posting threads **
First I tried to SIM unlock by paying but none of those codes were working, after I rooted my phone, followed some threads and tutorials but none of them worked.
Any solution?
HTC ONE M8 :
-Android Version : 5.0.1
-Phone is European ( I am located in Europe)
Quantix said:
after I rooted my phone, followed some threads and tutorials but none of them worked.
Click to expand...
Click to collapse
If you are trying tutorials for other phones, they won't work; and you should stop doing that.
The only "mod" or "hack" (free) method to unlock the SIM on the M8 required s-off. And it no longer works on Lollipop.
Paid unlock services are probably your best bet. What pay sites did you try? I've seen cellunlocker.net recommended by various XDA members, but I've never used it myself (and can't personally vouch for the service). And those recommendations were on the One X (EVITA) so I'm not sure how well they can unlock the M8.
redpoint73 said:
If you are trying tutorials for other phones, they won't work; and you should stop doing that.
The only "mod" or "hack" (free) method to unlock the SIM on the M8 required s-off. And it no longer works on Lollipop.
Paid unlock services are probably your best bet. What pay sites did you try? I've seen cellunlocker.net recommended by various XDA members, but I've never used it myself (and can't personally vouch for the service). And those recommendations were on the One X (EVITA) so I'm not sure how well they can unlock the M8.
Click to expand...
Click to collapse
I tried UnlockRiver. They sent me the unlock code but it didn't work, It's because they said it is a newer version of phone.
Quantix said:
I tried UnlockRiver. They sent me the unlock code but it didn't work, It's because they said it is a newer version of phone.
Click to expand...
Click to collapse
I'd suggest another service, possibly a few. They can be a bit hit or miss with getting a working code on some of these devices.
SuperCID
redpoint73 said:
I'd suggest another service, possibly a few. They can be a bit hit or miss with getting a working code on some of these devices.
Click to expand...
Click to collapse
I am wondering about SIM unlocking my AT&T variant to use over sees. I currently have SuperCID but wasnt sure if that accomplished basically the same thing as SIM unlock. Thanks.
thelangosta said:
I am wondering about SIM unlocking my AT&T variant to use over sees.
Click to expand...
Click to collapse
Go to AT&T's website, and fill out the form to get the unlock SIM code. I don't even think you need to be an ATT customer to do this. Although sometimes, folks have had problems with the device's IMEI not being found in the database.
I think a law was passed within the last couple years, that US carriers need to allow customers to SIM unlock their phones.
thelangosta said:
I currently have SuperCID but wasnt sure if that accomplished basically the same thing as SIM unlock. Thanks.
Click to expand...
Click to collapse
This worked (SuperCID gave SIM unlock) early on when the phone released, but hasn't been the case for quite a while now.
You can try S-OFF.
1: Unlock yoru bootloader with htcdev
2: Flash twrp and SuperSU
3: Install SunShine S-OFF apk ( from: theroot.ninja )
4: And your phone is Sim Unlocked
5: http://forum.xda-developers.com/showthread.php?t=2735235 use this to back 100% stock EU
6: Use One_M8_All-In-One_Kit_v and click Command: Return to S-ON
Your phone is 100% Stock, you have a waranty and your phone is Sim unlocked.
czifraj2 said:
You can try S-OFF.
1: Unlock yoru bootloader with htcdev
2: Flash twrp and SuperSU
3: Install SunShine S-OFF apk ( from: theroot.ninja )
4: And your phone is Sim Unlocked
5: http://forum.xda-developers.com/showthread.php?t=2735235 use this to back 100% stock EU
6: Use One_M8_All-In-One_Kit_v and click Command: Return to S-ON
Your phone is 100% Stock, you have a waranty and your phone is Sim unlocked.
Click to expand...
Click to collapse
S-off does NOT automatically sim unlock the phone ! And next time read the comments above yours !!!
Mr Hofs said:
S-off does NOT automatically sim unlock the phone ! And next time read the comments above yours !!!
Click to expand...
Click to collapse
I used S-OFF ago a 2 hours! I have got a Hungarian Vodafone phone and now this phone Unlocked I try Hungarian T-Mobile sim card and Hungarian Telenor sim card and worked! I can call and send sms and i have a mobile data... So?
czifraj2 said:
I used S-OFF ago a 2 hours! I have got a Hungarian Vodafone phone and now this phone Unlocked I try Hungarian T-Mobile sim card and Hungarian Telenor sim card and worked! I can call and send sms and i have a mobile data... So?
Click to expand...
Click to collapse
Did you try other carrier SIMs before you were superCID? It may have worked then as well. It seems there is a good chance that you bought an unlocked phone.
czifraj2 said:
I used S-OFF ago a 2 hours! I have got a Hungarian Vodafone phone and now this phone Unlocked I try Hungarian T-Mobile sim card and Hungarian Telenor sim card and worked! I can call and send sms and i have a mobile data... So?
Click to expand...
Click to collapse
So nothing, there is no proof that it was locked anyway. I know my stuff just like redpoint. My previous comment stays.
Who says it you haven't gotten a refurbished one, maybe it was factory unlocked already. Even new phones are shipped with s-off already !
I (we) have seen so many carrier locked threads here that i can tell you that s-off does not give you carrier unlock features. There is more needed and the tutorial that was active doesn't work anymore ! I'm long enough around here to say that with a 200%......
Have you even been reading up on this topic, did you have a read here about what's needed to achieve sim unlock ?
http://forum.xda-developers.com/showthread.php?t=2708567
So.......
Mr Hofs said:
S-off does NOT automatically sim unlock the phone !
Click to expand...
Click to collapse
I agree to this; and also to the notion that the device was probably just SIM unlocked to begin with.

explaining the carrier switch capabilities (ATT->Tmobile)

I have a "carrier-locked" ATT note 10 (SM-N975UZKEATT) that I would like to use on Tmobile.
1) Is the only thing required to get the phone working with Tmobile a carrier flash? Do you really no longer need to unlock the device (carrier unlock)?
2) any guides that show this process from att to tmobile?
Thanks
rogue1ne said:
I have a "carrier-locked" ATT note 10 (SM-N975UZKEATT) that I would like to use on Tmobile.
1) Is the only thing required to get the phone working with Tmobile a carrier flash? Do you really no longer need to unlock the device (carrier unlock)?
2) any guides that show this process from att to tmobile?
Thanks
Click to expand...
Click to collapse
You still need to get your device carrier unlocked before it will work on another carrier.
BladeRunner said:
You still need to get your device carrier unlocked before it will work on another carrier.
Click to expand...
Click to collapse
Thanks for the clarification
rogue1ne said:
I have a "carrier-locked" ATT note 10 (SM-N975UZKEATT) that I would like to use on Tmobile.
1) Is the only thing required to get the phone working with Tmobile a carrier flash? Do you really no longer need to unlock the device (carrier unlock)?
2) any guides that show this process from att to tmobile?
Thanks
Click to expand...
Click to collapse
Adding a little more to this:
1.) As an option (if preferred) you can most likely just keep the firmware installed on the phone and use it as it is. Tmobile is rather friendly with BYOD compared to AT&T. The phone will reconfigure some settings based on the settings that the Tmobile SIM card will have on it. Once unlocked just put the Tmobile sim card in and that should be all it takes. You may need to double check the APN settings though to make sure they are complete and accurate.
2.) Just look/search/research and you will find the multitude of discussions and tutorials on this. The process is the same as on the S9+. You won't have any problems finding out how to do this.

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