Develop Bugs

Query: Simultaneous GPRS data transfer & Voice call

I have an MDA C3. When web & walk is transferring internet Data and a call comes in, the phone does not ring. It goes directly to the voicemail.
T-Mobile customer service tell me that this is correct as you can either transfer internet data or make a call.
Is that right? I thought that was with WAP which is analagous to dial-up. Surely GPRS is analagous to Broadband.
Anyone else want to try this:
Go to Web & walk home page. Attempt loading up the guardian page (This will take a while). Whilst this is loading, call your phone number and see if it rings or goes direct to VM.
I spend lots of time browsing so I must be losing lots of calls!
Feedback greatly appreciated.

From what I have heard only UMTS devices can support simultaneous voice/data.

Yes - but not GRPS that uses GSM band instead of UMTS.
However, some devices have troubles keeping the data link active when a call comes in.

I am having the same issue (also on T-Mobile UK).
Then IE is running or AS is downloading my mail (I use direct push) all my calls go straight to voicemail.
This is worrying as I just moved over to T-Mobile for the web n walk package to allow me to have instant e-mails. This is a pain if it means I miss calls whilst my mail is downloading.
You'd think that the chances of the 2 coinciding are slim (I don't get a lot of mail, maybe 10 per day) but the wife has already complained 3 times since Friday that she went straight to voicemail, and each time it was exactly as i got a new mail.
Is this a limit of GPRS, the Orbit or just T-Mobile?
Thanks
Dae

I was surprised too... Thats why I posted the query. I thought my phone and/or SIm were faulty. But T-Mobile tell me thats how its supposed to work.
With W&W and Email, Its really hard for someone to get through with a voice call. It was worrying for me as I tend to browse the net whenever I am waiting around. This means that when I am on the bus surfing, no one can get through to me!!
Surely if there is a limitation, then the phone should give precendence to the Voice call. After all, you can pick up your emails or surfing where you left off.
I would really be interested to see if this is a T-Mobile only problem.

No itschase is spot on.
It's not a t-Mobile problem, it's the same for any GSM based network.
Only 3g (UMTS) phones can do data and voice at the same time. No matter what network you are on.

I have just run an experiment in the office as follows:-
Me (artemis with v3 black and blue) - Voicemail when data active
person 1 (MDA compact III - v3 black and blue) - Voicemail when active
person 2 (hermes) - no Voicemail when active.
We are all on t-mobile UK, and therefore it doesn't look like a network issue, but maybe a ROM problem?

daesimps said:
therefore it doesn't look like a network issue, but maybe a ROM problem?
Click to expand...
Click to collapse
What problem? Everything is working as it supposed to. If it's so important to you. Go buy a 3g phone!

I now fully appreciate that 3g phones are the only ones to support this type of behaviour.
I was trying to be helpful and post the results of my test as at that point I didn't realise that only 3g phones worked as such. I was lead to believe this by wikipedia:-
"Class B
Can be connected to GPRS service and GSM service (voice, SMS), but using only one or the other at a given time. During GSM service (voice call or SMS), GPRS service is suspended, and then resumed automatically after the GSM service (voice call or SMS) has concluded. Most GPRS mobile devices are Class B. "
Obviously this is not the case.
Bring on the HTC Kaiser!!!

Gajet said:
What problem? Everything is working as it supposed to. If it's so important to you. Go buy a 3g phone!
Click to expand...
Click to collapse
I incorrectly assumed that whilst browsing, if a voice call comes in, the phone would give priority to the call.
If I had known what I know now at the time I signed my 18M contract I would have bought a 3g Phone! Its just annoying that i'm stuck with it for another 12M. T-Mobile push the fact that they have set the internet free... but what they fail to get across to everyday users is that its "AT THE EXPENSE OF THE VOICE CALLS"

Because T-Mobile forced you to buy one of their 2.5g phones rather than one of their 3g phones?

I have no problem receiving phone calls while browsing the internet on the P3300.

cduijker said:
I have no problem receiving phone calls while browsing the internet on the P3300.
Click to expand...
Click to collapse
Neither have I to be honest, the issue only arises while you are actively downloading data. However once the website has loaded, you are free to accept calls again whilst still looking at the site in the browser.

Gajet said:
Neither have I to be honest, the issue only arises while you are actively downloading data. However once the website has loaded, you are free to accept calls again whilst still looking at the site in the browser.
Click to expand...
Click to collapse
As a test I started downloading a dummy 32MB testfile on my P3300 (from speedtest.bbned.nl) and I called my mobile with another phone.
There was no problem; I received the call while downloading the file.
Maybe it depends on the operator? I am in Holland on T-Mobile

daesimps said:
I now fully appreciate that 3g phones are the only ones to support this type of behaviour.
I was trying to be helpful and post the results of my test as at that point I didn't realise that only 3g phones worked as such. I was lead to believe this by wikipedia:-
"Class B
Can be connected to GPRS service and GSM service (voice, SMS), but using only one or the other at a given time. During GSM service (voice call or SMS), GPRS service is suspended, and then resumed automatically after the GSM service (voice call or SMS) has concluded. Most GPRS mobile devices are Class B. "
Obviously this is not the case.
Bring on the HTC Kaiser!!!
Click to expand...
Click to collapse
Hi,
It's not enough to have a class A (2G) device, but also DTM (Dual Transfer Mode/Simple Class A) support has to be active in the specific network, otherwise only 3G device on 3G network will provide Class A (simultaneous voice & data).
In fact, there are quite many models from Nokia during last year that support DTM, but as already mentioned, it's not enough.
FYI,
Zohar

cduijker said:
As a test I started downloading a dummy 32MB testfile on my P3300 (from speedtest.bbned.nl) and I called my mobile with another phone.
There was no problem; I received the call while downloading the file.
Maybe it depends on the operator? I am in Holland on T-Mobile
Click to expand...
Click to collapse
Is that an EDGE network ?

I got the Artemis with PV Black&Blue v3 ROM.
I can receive calls while pages are loading in IE.
I think this is a provider problem.
The phone provider has to intercept your GPRS connection and establish the GSM connection. Maybe T-Mobile just rejects calls while a GPRS connection/transfer is active.
A1 intercepts the page download and my call comes in.
When I pick up, the GPRS connection is closed completely. (not just pending)
So receiving calls while surfing is no problem for me with Austrian A1 provider.
Any other experiences?

Gajet said:
Is that an EDGE network ?
Click to expand...
Click to collapse
no, just gprs; no edge.

cduijker said:
no, just gprs; no edge.
Click to expand...
Click to collapse
...then it's no way you'll get simultaneous voice and data (class a).

[Q] Data features on the HTC M8 dual Sim

Dears,
Am in the process of researching/buying an HTC M8 dual SIM phone, can someone please advise if it is feasible to STOP Mobile DATA on a certain line (Ex: Line1) and ENABLE Mobile Data on the other line (Ex: Line2).
Thanks for all your help.
Regards,
H

Bad dual sim management
Better late than never, right?
You find "dual sim management" in the phone's settings.
This is where you can activate and deactivate each sim and where you set the preferred sim for mobile data.
So, yes, you can easily switch the sim that's being used for mobile data.. However, the BIG restriction is, that the sim 2 radio only supports 2G (up to EDGE). So, in order to use high speed internet from the provider whose sim is located in slot 2 you actually have to swap the sim cards. Also, there's no way to automatically switch to the other network's mobile data in case you lose mobile data coverage on the preset network . You really have to tell the phone manually which network to use.
Another big issue for me is that I can't preset the network I use for calls. So, my sim 1 is for data only. sim 2 is for voice calls and texts. Remember: it has to be this way because only sim 1 supports 3G/4G. Now, when I initiate a call via voice or via my car's bluetooth unit the phone automatically tries to use sim 1 as the default for calls. I can't set it up to use sim 2 as the default call handler and there's no dialogue asking me which sim to use like when I dial manually. That's really bad, all other companies that offer dual sim phones have better management options in their software's settings.
I tried using alternative phone apps which give you the option of choosing a default sim for calls but this only works for voice-dialing; bluetooth still overrides the alternative dialer and always goes with the stock one.
I hope this helps - so actually I'd advice agaist the M8 dual sim despite it being beautiful and having really good hardware.
digitalhug said:
Dears,
Am in the process of researching/buying an HTC M8 dual SIM phone, can someone please advise if it is feasible to STOP Mobile DATA on a certain line (Ex: Line1) and ENABLE Mobile Data on the other line (Ex: Line2).
Thanks for all your help.
Regards,
H
Click to expand...
Click to collapse

dual sim standby - both 3g/4g ?

So I've read in a few reviews it's a dual sim standby (both sims are in standby for a phone call) and both of them are capable of 3g/4g at the same time?
anyone know?
reason I ask is in my country the 2g bands are closed so can't use any other dual sim phone (all of them force second sim to be on 2g)

I don't think both of them are capable of 4G for the simple reason 2 SIM from 2 different network providers = 2 IP address, and you need to know it's complex to make usable 2 IP address in the same time (MPTCP).
Then like on the OnePlus 2, you can only use one SIM for data and the other for phone calls/SMS/MMS in the same time.

The only phone that I am aware that is able to do 4g on one sim and 3g on the other is the mi5.
I am also keen to know if we can do the same on the one plus 3. I live in Singapore and 2g will be deactivated soon.
Sent from my X9009 using XDA-Developers mobile app

I'm not expecting the phone to use data on both. i'm more concerend about just being on standby for phone/msg on 3g (or 4 if possible). Like using your phone blocking data on the second sim. I don't see why it's so technologically hard. 2g is soon to be gone evrywhere

I have tested Mi5Pro and it have first sim 2G/3G/4G and the second sim 2G/3G simultaneously (dual sim stand-by).
I have read in a review than OP3 also. I will receive mine next monday, i will test ...

thanks a lot. anyone else can confirm ?

I can confirm .. i have received my op3 yesteday and it is 2G/3G/4G on sim1 and 2G/3G on sim2 simultaneously. Sim2 is only for calls and messages.
Like OP2 and other phones, it is possible to swap sims and in this case, sim2 is 2G/3G/4G with data and sim1 only 2G/3G for calls and messages.
I confirm also that op3 is dual sim stand-by and not dual sim active.

Le_Matriciel said:
I can confirm .. i have received my op3 yesteday and it is 2G/3G/4G on sim1 and 2G/3G on sim2 simultaneously. Sim2 is only for calls and messages.
Like OP2 and other phones, it is possible to swap sims and in this case, sim2 is 2G/3G/4G with data and sim1 only 2G/3G for calls and messages.
I confirm also that op3 is dual sim stand-by and not dual sim active.
Click to expand...
Click to collapse
So your SIM 1 is on 4G/LTE and SIM 2 can receive calls and text in 3G mode?

Yes but when call is made on SIM2, data on SIM1 is interrupted (dual stand-by)

Le_Matriciel said:
Yes but when call is made on SIM2, data on SIM1 is interrupted (dual stand-by)
Click to expand...
Click to collapse
Is this by design? That seems like a very frustrating limitation. I would be okay with data services flipping over to SIM2 while on the phone there.
I also seem to have a problem of the OP3 kicking down from LTE to HSPA when I make a phone call.
Any ideas?

appletalk said:
Is this by design? That seems like a very frustrating limitation. I would be okay with data services flipping over to SIM2 while on the phone there.
I also seem to have a problem of the OP3 kicking down from LTE to HSPA when I make a phone call.
Any ideas?
Click to expand...
Click to collapse
Yes, it is designed like this, like all dual sim except Asus ZenFone 2, Galaxy S4 Duo and few other models.
LTE networks has not "phone circuits" and call are made in 3G (phone connect in HSPA during call). This is for all LTE phones.
LTE calls are possible with VoLTE protocol witch is IP voice communications and not voice circuit.
For using VoLTE, the phone need compatible with this protocol AND operators needs to activate this functionality.

Le_Matriciel said:
Yes but when call is made on SIM2, data on SIM1 is interrupted (dual stand-by)
Click to expand...
Click to collapse
While you are using data on SIM1, will an incoming call on SIM2 ring on the phone or will the call be treated as though the phone is off-network and be directed to voicemail?

rickhuizinga said:
While you are using data on SIM1, will an incoming call on SIM2 ring on the phone or will the call be treated as though the phone is off-network and be directed to voicemail?
Click to expand...
Click to collapse
incoming call on SIM2 will ring.
Both the SIMS can receive calls no matter which of them are used for mobile data.
---------- Post added at 10:18 PM ---------- Previous post was at 10:01 PM ----------
spritey176 said:
So I've read in a few reviews it's a dual sim standby (both sims are in standby for a phone call) and both of them are capable of 3g/4g at the same time?
anyone know?
reason I ask is in my country the 2g bands are closed so can't use any other dual sim phone (all of them force second sim to be on 2g)
Click to expand...
Click to collapse
It is dual sim standby and both the sims are in standby for a phone call. Both of them are capable of 4G/3G/2G but NOT at the same time. 4G can be used only in one sim slot at a time. It can be set by going to settings > SIM cards> Preferred SIM for Cellular data. Whichever SIM you choose here will have 4G option. It can be changed from settings>Cellular networks > your SIM card > Preferred network type. (4G or 3G or 2G). The other SIM can have either 3G or 2G but there is no option to choose it. The only way is to click on 'Network operators' option from Cellular networks menu and choose a 2G or 3G service. Hope it helps.

I get 4g on each sim but you have to pick one for data but both are 4g

So if I have 2 sims, one for calls with 6gb 4g and one for data with 15gb 4g, when I finish the 6gb on 1st sim I can switch the data to the other sim via software? Thanks

Your right you can

Important about dual active
Le_Matriciel said:
Yes, it is designed like this, like all dual sim except Asus ZenFone 2, Galaxy S4 Duo and few other models.
LTE networks has not "phone circuits" and call are made in 3G (phone connect in HSPA during call). This is for all LTE phones.
LTE calls are possible with VoLTE protocol witch is IP voice communications and not voice circuit.
For using VoLTE, the phone need compatible with this protocol AND operators needs to activate this functionality.
Click to expand...
Click to collapse
This is true, but you can also add to the list of "Dual Active" phones all Huawei premium phones:
Mate 7, Mate 8, Honor 6, and probably Honor 7 and 8.
They all have DUAL ACTIVE SIM CARDS, which means that you can have a call on SIM-1 and get a waiting call on SIM-2, then you can answer the call and swap between the two active calls!! I even tried calling SIM-1 from SIM-2 and it was actually ringing!!
Also more importantly, when using data on SIM-1, you can make or receive a call on SIM-2 without interrupting data.
That's pretty amazing, but with a major drawback (at least for me, it is): 3G/4G service is only accessible on SIM-1 slot!! The SIM card in slot-2 will always be 2G and would never ever access 3G/4G networks
This is bad because I travel a lot, and I always need to be able to switch data from SIM-1 to SIM-2 and vice versa. The only option I have is to physically swap SIM cards between slots, which actually ruins the whole concept of having DUAL SIM mobile
My guess is that they are actually using two separate modems, each one is dedicated to one of the two SIM slots, and only one of them supports 3G/4G connectivity.

TheLoverMan said:
Your right you can
Click to expand...
Click to collapse
so, you are saying that both sims are 3G/4G capable, but can be used for data one at a time, and can be switched anytime via settings ?

I have a questión, so if a dual sim phone have 3g/4g capabilities on both sims, is there a way to make like a failover setup such as if sim1 looses data the phone switches to sim2 data automatically and viceversa?

I have problem in my one plus 3 network issues both SIM are not working properly both SIM search for network frequently when I switched data no network can anyone give solution I tried all rebooting, factory reset, searching network manually.

VoWiFi over second "data SIM" - is it possible?

Hey!
My network operator supports VoWiFi feature, which i'm using a lot. I'm traveling quite often and using VoWiFi i can use voice services using domestic prices worldwide.
I have dual SIM card phone, in the second slot i have data sim.
Here the question comes - is there any way to configure a phone to use VoWiFi feature over data connection from the second SIM?
Essentially VoWiFi feature requires just internet connection, so in theory such approach should work, but do not know if it is possible to configure the phone this way.
Would appreciate any help

Gentlemen,
Any help would be appreciated.
I do have workaround - to use the second phone, share WiFi from it and then i can use VoWiFi on my main phone. But it' super inconvenient - you always need to care 2 phones.
If you know any apps/solutions please let me know.

I have dual SIM and I am able to have Wifi Calling enabled on both SIMs at the same time.
However - you are talking about VoLTE if you're talking about using the data connection on the second SIM rather than a WiFi connection.
Again, however, this should be possible - I can enable VoLTE on both SIMs. It's under Mobile Data in the Settings app...

wheeliemonster said:
I have dual SIM and I am able to have Wifi Calling enabled on both SIMs at the same time.
However - you are talking about VoLTE if you're talking about using the data connection on the second SIM rather than a WiFi connection.
Again, however, this should be possible - I can enable VoLTE on both SIMs. It's under Mobile Data in the Settings app...
Click to expand...
Click to collapse
VoLTE is different technology and is charged in my case differently. That's the reason i'm looking for an option to use data sim that the main sim uses this data connection for the call simulating "VoWiFi" and hence use domestic rates for the calls.
As i said above i can emulate this with two phones, but i still hope to find a solution where i can archive that with only one phone.

I'm looking for the same solution. My note 8 is rooted. The best I can do is set WiFi Calling as preferred over Network calling, but as soon as I activate Data for SIM#2, I lose WiFi calling and VoLTE for first SIM. Very inconvenient. Anyone have any clues how to force WiFi Calling using Data of SIM#2 ?

Question Switch mobile data to Active SIM (that is used during call)

Before OnePlus 9 Pro I used to have Huawei P30 Pro that automatically switched Mobile Data to SIM card that was used during a call. It gave me an ability to use internet regardless of SIM used for call (important scenario when driving, for instance). It's noteworthy that none of my 2 carriers support VoLTE / VoWiFi. Now for OP9 Pro this mission became impossible and it feels like a downgrade compared to 3-4 yr old phones.
Is there any solution for this? Maybe custom ROM, hack, whatever...

So at the moment you have Sim1 with data and Sim2 without data?
In settings you can set your preferred Simcard for calls, messages and Data.
Does setting Sim1 as preferred Simcard for data not work?

Bunecarera said:
So at the moment you have Sim1 with data and Sim2 without data?
In settings you can set your preferred Simcard for calls, messages and Data.
Does setting Sim1 as preferred Simcard for data not work?
Click to expand...
Click to collapse
My both SIM can be used for Mobile Data if I select explicitly, and regardless of preferred card (1 or 2) for data, I can't get data working in case I call from the card that was not selected as a preferred one.
The switch in SIM settings that says there must be VoLTE active on second card in order to make data working during a call from first one does not help. Simply because there is no VoLTE available from carrier.
For instance - I have preferred card SIM1 and I call from SIM2 (and need phone to switch to using data from SIM2 during a call), in this case during a phone call I have no data available at all. Very inconvenient in a car (navigation) or just if you have to check some info from internet during a call. Previous phone allowed to use such feature without VoLTE (same cards, same carriers), OP9 Pro doesn't. I wonder if it's a software limitation or hardware.
I am looking forward to change OP9 to Mi 11 Ultra now due to this... ((
My model is LE2120

VoLTE is unchecked in settings?
Otherwise, no idea dude...
Maybe check in Oneplus forums?

Hi I'm in almost the same situation like you.
The only way that i thought it can be done on the op is using tasker.
If you know how to use tasker and manage to do it, please let me know
Tasker will wait for and event like receiving a call, identify which sim the call in coming on, switch active data to the same sim the call comes in on, and viola

I've opted for the most radical way - switched to Samsung S21 Ultra. It was hard to tolerate such caveats like absence of mobile data auto switching, mid-end camera & fast-dying battery in flagship phone...