Develop Bugs

Useful General Information Regarding 2G and 3G for either CDMA or GSM modes

Useful General Information Regarding 2G and 3G for either CDMA or GSM modes
For CDMA Networks there are Only three Modes Controlling CMDA 2G or 3G:
CDMA only CDMA phone force Only 2G Mobile data. if 2G signal is too low you get no Signal.
EvDo only CDMA phone force Only 3G Mobile data. if 3G signal is too low you get no Signal
CDMA auto (PRL) CDMA phone can use both 2G and 3G Mobile data . if signal strength is low then 2G is favored more.
Please see Automatic Mode ( GSM/CDMA auto (PRL)
TWO GSM Modes that include the word "CDMA ",But They Do Not Relate to CDMA Networks :
WCDMA preferred GSM phone can use both 2G and 3G Mobile Data . if signal strength is low 3G is Preferred .
WCDMA only GSM phone forces only 3G Mobile Data . if 3G signal is too low you get no Signal .
Other GSM Modes :
GSM only GSM phone forces only 2G Mobile Data . if 2G signal is too low you get no Signal .
GSM auto (PRL) GSM phone can use both 2G and 3G data Mobile Data . if signal strength is low 2G is Preferred
Automatic Mode :
GSM/CDMA auto (PRL) - phones equipped with GSM and CDMA .( Not Sure ) phone attempt to stay connected to the Mobile Data type that works the best ( through choosing the CDMA network directly or GSM Roaming networks , not sure ) ??????.
Auto PRL ( Preferred Roaming List ) :
this list should be updated frequently , help connect to 3G ? . to get update ( through *228 or through Dialing ##778 , Then Select Prl then Update . i don't have much Knowledge about the following , But some who change Carrier would download PRL suitable for the New Carrier and replace the existing . through using certain Software ( Powerful Software that Can damage Your phone if you Don't know what you are doing ) , and is that required or Not . for myself i would not do it unless it is a Must.
Hope help testing and adjusting setting for 2g,3G , i myself was confused about some of those setting Especially WCDMA Preferred
You can reach All the above Options through Phone Information menu ( called also testing menu ) by dialing *#*#4636#*#*​I appreciate if you hit thanks Button , if you found this Post useful

trkaaa said:
GSM/CDMA auto (PRL) - phones equipped with GSM and CDMA .( Not Sure ) phone attempt to stay connected to the Mobile Data type that works the best ??????.
Auto PRL ( Preferred Roaming List ) :
this list should be updated frequently , maybe help connect to 3G ?? . to get update ( i think *228 or i think through Dialing ##778 ,Not Sure , Then Select Prl then Update . i don't have much Knowledge about the following , But some who change Carrier would download PRL suitable for the New Carrier and replace the existing . through using certain Software ( Powerful Software that Can damage Your phone if you Don't know what you are doing ) , and is that required or Not . for myself i would not do it unless it is a Must.​Hope help testing and adjusting setting for 2g,3G , i myself was confused about some of those setting Especially WCDMA Preferred
Click to expand...
Click to collapse
While working for Verizon I know that *228 option 2 is the one you select to update just the PRL. When updating the PRL it just ensures your phone has been updated on the network with latest additions to towers and such. Possibly can improve your signal strength in areas where improvements or new towers have been added. This also can help when you travel in extended network where Verizon has a roaming agreement. It is recommended to do so atleast 1 time every 3 months.
Choosing option 1 from the menu is for when you are changing devices(esn's) on your number. This will program the proper MDN and MIN as well as SID into the phone so it can work on your number and the Verizon network. Sometimes doing option 1 can resolve issues with your device as well, but in rare cases.

so there is no way can force the htinc2 to work with h or 3g

m_srayi said:
so there is no way can force the htinc2 to work with h or 3g
Click to expand...
Click to collapse
yes you can force 3G as follows ( All mentioned in my above Post ) :
for CDMA ( if you want to use CDMA network Only )
EvDo only CDMA phone force Only 3G Mobile data. if 3G signal is too low you get no Signal
For GSM ( if you want to use GSM networks only )
WCDMA only GSM phone forces only 3G Mobile Data . if 3G signal is too low you get no Signal .
if you don't want to force 3G only , But make 3G Preferred when Both 2G and 3G are available :
for CDMA ( if you want to use CDMA network Only ) :
CDMA auto (PRL) CDMA phone can use both 2G and 3G Mobile data . if signal strength is low then 2G is favored more.
For GSM ( if you want to use GSM networks only ) :
WCDMA preferred GSM phone can use both 2G and 3G Mobile Data . if signal strength is low 3G is Preferred .
For Both ( Auto ) :
GSM/CDMA auto (PRL) - phone attempt to stay connected to the Mobile Data type that works the best
You can reach All the above Options through Phone Information menu ( called also testing menu ) by dialing *#*#4636#*#*
i guess it works like this but not sure ,
if you choose EvDo onlythe phone will force the connection to Verizon Wireless 3G only , it will not try to use the sim Card to use the roaming GSM networks !!!
if you moved to another GSM carrier ,then you have only GSM ( No CDMA ) , then if you used WCDMA only the phone will only connect to the 3G provided by this Carrier

[Q] How to disable HSPA / HSDPA for better battery life

When I was a Galaxy S2 i9100 had a code (* # 301279 #) which disabled the HSPA, but the 3G was still functioning normally
In CM9 rom settings in the menu had Advance, where he had the option of UMTS would be to use only the 3g without HSPA.
As in my town have problems mode HSPA connection, it would be a good alternative for battery saving.
I am using the stock Rom 4.1.1 JB
thank you

Try #*#*4636*#*#
Then under phone information select gsm only
In settings -> network -> more -> mobile network -> 2g only

Reception issues finally solved! [TELUS maybe BELL]

So I've been struggling with shoddy reception for a long while. The desire isn't exactly known for its reception, but recently I changed buildings and it's been unbearable.
Symptoms:
- If coverage is poor I'd go in and out of service frequently
- Sometimes, even with bars, texts won't send and calls won't go thru
- Sometimes, stuck in emergency calls only until a reboot
- If coverage was is, no issues
Cool. So the flaky behaviour all had to do with preferred network type. Turns out TELUS doesn't have a 2G network to fall onto if the 3G signal is crappy (remember they used CDMA tech for their 2G; it's not compatible). But most roms in here always assume you do. The phone would go full retard (beg your pardons) trying to find the 2G network that doesn't exist. In addition, many power saving "tweaks" change the preferred network type from WCDMA perferred to GSM auto PRL ... both assume you have a 2G network. The latter specifically has brutal performance on TELUS network.
Fix :
Get a build.prop editor from the market
Change ro.telephony.default_network = 2
2 is WCDMA (3G) only
Reboot
or
Dialpad > *#*#4636#*#* > Phone information > Set preferred network type > WCDMA only
But I don't believe this method will stick after a reboot
Cheers guys, I hope this helps you like it did me
ro.telephony.default_network=
0 = WCDMA Perfered
1 = GSM Only
2 = WCDMA Only
3 = GSM/WCDMA (auto mode, according to PRL)
4 = CDMA / EVDO. Perfered

Force 4G only.

Is there any way we can force cellular network to be 4G LTE only? I want to stop it from automatically switching to H+.
I'm on stock nougat, rooted.

I think you can change it in the hidden service menu. BUT be VERY CAREFUL not to change other things in there.
First make sure your preferred network type is LTE auto, not 3g or 2g only.
Next, go to phone / dialer app.
Enter: *#*#4636#*#*
It should automatically direct to Testing menu, with Phone information, Usage statistics, and Wi-Fi information choice.
Select "Phone information".
Warning: There's many things to see here, but you can easily ruin your radio band in here. Just follow this guide and do not even touch other things.
Go to "set preferred network type"
I'm not sure what it would show for your phone, but for mine it shows "LTE/UMTS auto (PRL)".
Select "LTE only". It should immediately reset your network to 4G.
If it still switches to 3G, then test other options in the "set preferred network type" option.
After finish, exit the hidden menu and clear it from recent apps menu.
Warning: DO NOT CHANGE OTHER VALUES IN THERE IF YOU DON'T KNOW WHAT YOU'RE DOING. IT COULD RUIN YOUR RADIO BAND IF YOU'RE NOT CAREFUL.

Thanks. It worked.

Question How to change preferred network type?

I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?

It appears that some providers suck hard and don't want to allow you to switch networks. That's not a phone thing-y, it's a provider thing-y. Which means that your phone will of course still change networks, but only if the "higher" one is not available, ergo your phone will only connect to 4G, if 5G is not available - if the 5G connection is bad, that will probably cause problems for you, because your phone will probably not want to connect to 4G automatically.
I can easily switch preferred network types
Settings -> Network & Speed -> SIMs -> (scroll down, between 4G Calling & Carrier settings version) -> Preferred network type (5G, 4G, 3G, 2G).
It that's not available, your network carrier sucks. No more to say here.
I'd suggest you either switch providers, or contact your provider to see if they are willing to change this. It's definitely on their end, cuz people like me can change the settings easily.

cd993 said:
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
Click to expand...
Click to collapse
You may be able to change preferred network type with *#*#4636#*#* dialer code.

cd993 said:
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
Click to expand...
Click to collapse
EE (& BT Mobile) hide the menu.

Morgrain said:
It appears that some providers suck hard and don't want to allow you to switch networks. That's not a phone thing-y, it's a provider thing-y. Which means that your phone will of course still change networks, but only if the "higher" one is not available, ergo your phone will only connect to 4G, if 5G is not available - if the 5G connection is bad, that will probably cause problems for you, because your phone will probably not want to connect to 4G automatically.
I can easily switch preferred network types
Settings -> Network & Speed -> SIMs -> (scroll down, between 4G Calling & Carrier settings version) -> Preferred network type (5G, 4G, 3G, 2G).
It that's not available, your network carrier sucks. No more to say here.
I'd suggest you either switch providers, or contact your provider to see if they are willing to change this. It's definitely on their end, cuz people like me can change the settings easily.
Click to expand...
Click to collapse
Or you could just make sure Adaptive Connectivity is enabled and not worry about it.
You would have to drag me away from EE (BT Mobile) screaming and kicking given the coverage and speeds they have, to say they suck over one menu option missing is absolutely laughable.

cd993 said:
I'm on EE UK but the preferred network type setting doesn't appear to be present in SIM options?
Click to expand...
Click to collapse
When the Note 20 first came out a lot of carriers wouldn't let you change network type but there's an app in the play store that was working on the notes.
Force 4G/5G Only - Apps on Google Play
Lock your phone to 4G/5G mode or VoLTE network
play.google.com

ggrant3876 said:
When the Note 20 first came out a lot of carriers wouldn't let you change network type but there's an app in the play store that was working on the notes.
Force 4G/5G Only - Apps on Google Play
Lock your phone to 4G/5G mode or VoLTE network
play.google.com
Click to expand...
Click to collapse
Crashes or alternately just disappeared for me when I click on the first option "4G LTE with only one SIM". Reported the crash. Thanks, though. Maybe they'll update it.

An alternative to the dialer code is to boot into safe mode, and the preferred network type setting will appear in: Settings -> Network & internet -> SIMs between Data warning & limit and Carrier settings version (at least it does on my Google Fi Pixel 6 Pro).