Develop Bugs

[Q] Simultaneous Voice and Data GS3 T-Mobile

I have a GS3 with T-Mobile prepaid (60 a month) my Simultaneous Voice and Data is not working? is this a problem with the prepaid service? the Simultaneous Voice and Data will work for a few min's then cut off and i cant get data back until i end the call im on.
I'm running Cm10 Nightlights
I was on Simple mobile and had the same problem.
is this a phone problem, service problem, ROM problem? i thought T-Mobile supported Simultaneous Voice and Data?

Works great for me but makes sure you have 3g or better.
Sent from my SGH-T999 using Tapatalk 2

elesbb said:
Works great for me but makes sure you have 3g or better.
Sent from my SGH-T999 using Tapatalk 2
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i for sure have 3G or better in my area, are you using the Prepaid service?

Amore514 said:
i for sure have 3G or better in my area, are you using the Prepaid service?
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Since Tmobile using GSM network, it should be possible anyway. Did you try rebooting?

agm1101 said:
Since Tmobile using GSM network, it should be possible anyway. Did you try rebooting?
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ya i have restarted, i also have tried 3 other ROMS beside CM

[Q] Does Mobile Data affect call quality?

I keep mobile data off most of the time.
Just wondering if it makes any difference in call quality.
Also between:
Gprs vs Edge vs 3G vs Hspa+
is there any noticeable call quality difference?
Hercules on TMo.
Thanks.

House3272 said:
I keep mobile data off most of the time.
Just wondering if it makes any difference in call quality.
Also between:
Gprs vs Edge vs 3G vs Hspa+
is there any noticeable call quality difference?
Hercules on TMo.
Thanks.
Click to expand...
Click to collapse
Nope. Data is data, phone and texts are handled separately.
Sent from my cell phone telephone....

No it doesn't affect data

kj2112 said:
Nope. Data is data, phone and texts are handled separately.
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Click to collapse
That's what I thought, but then, why are calling times rated by 3g vs 2g?
Like 16 hours of talk time on 3G and 30 hours on 2G.
What's that all about?

House3272 said:
That's what I thought, but then, why are calling times rated by 3g vs 2g?
Like 16 hours of talk time on 3G and 30 hours on 2G.
What's that all about?
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Click to collapse
3g uses more battery than 2g, obviously. You don't need data on at all to make phone calls.

House3272 said:
I keep mobile data off most of the time.
Just wondering if it makes any difference in call quality.
Also between:
Gprs vs Edge vs 3G vs Hspa+
is there any noticeable call quality difference?
Hercules on TMo.
Thanks.
Click to expand...
Click to collapse
Yes sir try using wifi calling and u will see the different
Sent from my SGH-T989 using Tapatalk 2

meekrawb said:
3g uses more battery than 2g, obviously. You don't need data on at all to make phone calls.
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It's that much? Wow.
esema1o said:
Yes sir try using wifi calling
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Any suggestions, for a wifi calling app that is?

House3272 Any suggestions, for a wifi calling app that is?[/QUOTE]
There is a lot of free apps on the Play Store for wifi calling.. But some do need ROOT access for it to work.. [my preference - most of the good ones will need root access ]
Sent from my SAMSUNG-SGH-T989 using xda premium

Maxninja said:
House3272 Any suggestions, for a wifi calling app that is?
Click to expand...
Click to collapse
There is a lot of free apps on the Play Store for wifi calling.. But some do need ROOT access for it to work.. [my preference - most of the good ones will need root access ]
Sent from my SAMSUNG-SGH-T989 using xda premium[/QUOTE]
https://play.google.com/store/apps/details?id=com.snrblabs.grooveip
Sent from my SAMSUNG-SGH-T989 using xda premium

Dual Transfer Mode (DTM)?

Does anybody know if it works on t-mobile? Googled it and could only find an answer from 2007 saying it didn't back then but this is 2013 so I was wondering if it has changed since then. I have seen the build prop tweak (ro.ril.enable.dtm=1) for this to enable it in different threads but was just curious if it actually works on tmobile.
Sent from my SGH-M919 using Tapatalk 2

What exactly is Dual transfer mode?
Sent from my GT-I9505G using xda premium

Dual Transfer Mode (DTM) is a protocol based on the GSM standard that makes simultaneous transfer of Circuit switched (CS) voice and Packet switched (PS) data over the same radio channel (ARFCN) simpler. Without DTM, the mobile device must be capable of reception and transmission simultaneously (full-duplex) requiring complex and expensive circuitry in the mobile terminal. With DTM this requirement doesn't exist and makes the device implementation simpler and cheaper. DTM is a 3GPP feature introduced in R4 of the specification series.

richardlibeau said:
Dual Transfer Mode (DTM) is a protocol based on the GSM standard that makes simultaneous transfer of Circuit switched (CS) voice and Packet switched (PS) data over the same radio channel (ARFCN) simpler. Without DTM, the mobile device must be capable of reception and transmission simultaneously (full-duplex) requiring complex and expensive circuitry in the mobile terminal. With DTM this requirement doesn't exist and makes the device implementation simpler and cheaper. DTM is a 3GPP feature introduced in R4 of the specification series.
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Is this like using data while on a call? If so then yes it works. However you must be on 3g or greater for it to work.
Sent from my SGH-M919 using Tapatalk 2

elesbb said:
Is this like using data while on a call? If so then yes it works. However you must be on 3g or greater for it to work.
Sent from my SGH-M919 using Tapatalk 2
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Exactly I am always on lte, hspa, or edge usually so was just wondering if it worked for tmobile or not.
Sent from my SGH-M919 using Tapatalk 2

richardlibeau said:
Exactly I am always on lte, hspa, or edge usually so was just wondering if it worked for tmobile or not.
Sent from my SGH-M919 using Tapatalk 2
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Won't work on Edge though. But everything else it will i love it.

Wont work on LTE either. Only 3g/hspa+
If I actually did help, how bout a Thanks for 'ol times sake

ktetreault14 said:
Wont work on LTE either. Only 3g/hspa+
If I actually did help, how bout a Thanks for 'ol times sake
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Click to collapse
Why not? It should.

elesbb said:
Why not? It should.
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Click to collapse
I just tried it out on my phone. I set it to LTE/GSM only and whenever I made a call, it would drop off LTE and go to edge. When I set it to LTE/WCDMA/GSM, it would drop off LTE and join 4G when I made a call. I don't know why it does that though.

ghettoc401 said:
I just tried it out on my phone. I set it to LTE/GSM only and whenever I made a call, it would drop off LTE and go to edge. When I set it to LTE/WCDMA/GSM, it would drop off LTE and join 4G when I made a call. I don't know why it does that though.
Click to expand...
Click to collapse
Might have something to do with lte and that HD voice I keep seeing.
Sent from my SGH-M919 using Tapatalk 2

Voice calls while on LTE?

When you make or get a voice call on LTE, does your phone disconnect from LTE and switch to 3g/H? Just wondering if this is normal?

sharklaser12 said:
When you make or get a voice call on LTE, does your phone disconnect from LTE and switch to 3g/H? Just wondering if this is normal?
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Yes perfectly normal.
I believe its due to either LTE being Data only or LTE not being able to do Data and voice at the same time. I forget which one it is.

I think it's only data for now
Sent from my SGH-M919 using xda app-developers app

y2whisper said:
Yes perfectly normal.
I believe its due to either LTE being Data only or LTE not being able to do Data and voice at the same time. I forget which one it is.
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Click to collapse
It's actually because lte is being used as HD voice. I'm trying to disable HD voice to see if it changes the behavior.
Sent from my SGH-M919 using Tapatalk 2

LTE is data only for now. You're gonna have to wait for VoLTE (Voice over LTE)

SmiLey497 said:
LTE is data only for now. You're gonna have to wait for VoLTE (Voice over LTE)
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Click to collapse
That doesn't make sense though. If LTE is data only, then it would use LTE for data, and use 4G or anything else for voice, allowing you to have both voice and data.. Unless the radio can only support one frequency at a time then it would force it to use 4G or the next available frequency.

http://m.computerworld.com/s/articl...telephony_apps?mm_ref=https://www.google.com/
VoLTE will enable that... Right now the phones have to have two radios enabled at the same time... One for data and one got voice.
Sent from my SGH-M919 using xda app-developers app

How to turn off LTE on D850(ATT)

Sorry if this is obvious but I'm coming from an HTC and moto x but how can I turn off LTE on the d850? Having network connectivity issues with LTE..
Sent from my LG-D850 using XDA Premium 4 mobile app

montavious said:
Sorry if this is obvious but I'm coming from an HTC and moto x but how can I turn off LTE on the d850? Having network connectivity issues with LTE..
Sent from my LG-D850 using XDA Premium 4 mobile app
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Type this in the dialer 3845#*855# opinion is in there somewhere

jaythenut said:
Type this in the dialer 3845#*855# opinion is in there somewhere
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Click to collapse
It needs to be 3845#*850# because its the D850 not the 855

My M7 had an option to switch from LTE auot to WCDMA/GSM Auto - no such luck on the G3?
LTE at work is so over saturated I get better speeds on WCDMA but I can't get my phone to switch besides doing the dialer method.

Pilz said:
It needs to be 3845#*850# because its the D850 not the 855
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Didn't know that lol

montavious said:
Sorry if this is obvious but I'm coming from an HTC and moto x but how can I turn off LTE on the d850? Having network connectivity issues with LTE..
Sent from my LG-D850 using XDA Premium 4 mobile app
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Click to collapse
Tasker should be able to do this for you if the magic menu does not. You can even configure Tasker to automatically sense cell phone towers at work and convert to WCDMA, then auto-switch back to LTE once you are no longer in the vicinity of the cell phone towers. Just one of the many, many amazing and useful things Tasker can do for you.