Develop Bugs

GSM cdma switching

Is there any way know yet to force the incredible 2 to switch over to GSM mode once you unlock the sim
Sent from my ADR6350 using XDA Premium App

b0gman said:
Is there any way know yet to force the incredible 2 to switch over to GSM mode once you unlock the sim
Sent from my ADR6350 using XDA Premium App
Click to expand...
Click to collapse
I would like to know this as well.
I heard that the Thunderbolt can't do this so I doubt it.

Moved to general as not android development.

RacecarBMW said:
I would like to know this as well.
I heard that the Thunderbolt can't do this so I doubt it.
Click to expand...
Click to collapse
The Thunderbolt isn't a world phone, which is why you can't do it on the Thunderbolt.
Have you tried putting in a different SIM card? I haven't tried that, but if you switch to a GSM carrier, there should be a way to turn off CDMA roaming and enable the GSM options, that appear to be grey-ed out for some reason...

Called Verizon Global Support a few days ago and had them give me the SIM unlock code. Once unlocked I was able to insert a T-Mobile SIM card. I went to Settings>Call>Preferred Network and changed to GSM. I was able to make/receive phone calls on the T-Mobile network as well as connect to the Edge data service. I did however have to add the APN setting for T-Moble (epc.tmobile.com) to get Edge service.

I got the I2 a week ago and 2 times I have unlocked the screen to see a dialog box saying I have lost my data connection and prompted me to choose between CDMA and GSM modes. I haven't tried to switch modes, but it worries me that I am losing the data connection.

stings70 said:
Called Verizon Global Support a few days ago and had them give me the SIM unlock code. Once unlocked I was able to insert a T-Mobile SIM card. I went to Settings>Call>Preferred Network and changed to GSM. I was able to make/receive phone calls on the T-Mobile network as well as connect to the Edge data service. I did however have to add the APN setting for T-Moble (epc.tmobile.com) to get Edge service.
Click to expand...
Click to collapse
Even though the data is just Edge, it works on T-Mobile in the U.S.? Interesting. The only other global Android devices on Verizon so far - the Droid Pro and the Droid 2 Global - have T-Mobile and AT&T bands completely locked out. I wonder if it would work on AT&T as well.

Yah it works quite well you have to manually change the apns in the GSM settings. I did find the switch to change calling modes between GSM and cdma it's under settings ->call settings
Sent from my ADR6350 using XDA Premium App

If it's not switching over on its own, try the test mode - *#*#4636#*#* and then in there you can choose GSM (PRL) or WCDMA preferred, both of which switch you onto GSM or 3G GSM respectively.

Did anybory try?
BobbySteel said:
If it's not switching over on its own, try the test mode - *#*#4636#*#* and then in there you can choose GSM (PRL) or WCDMA preferred, both of which switch you onto GSM or 3G GSM respectively.
Click to expand...
Click to collapse
Did anybory try this? Is 3G works on Inc2?
By the way:
Inc2 supports:
CDMA 800/1900MHz +
UMTS/HSPA 900/2100MHz +
GSM/GPRS/EDGE 850/900/1800/1900MHz
And some info from t-mobile forum:
Mobile USA's frequency is the AWS 1700/2100 band also known as UMTS1700. Europe's band is 900/2100, also known as UMTS2100. The phone must be able to connect to uplink and downlink for it to be compatible on a network. Since his Nokia was UMTS2100 it could not connect to T-Mobile's 1700mhz uplink frequency.

3g works in the uk. No idea about T-Mobile
Sent from my Motorola RAZR via SMS

BobbySteel said:
3g works in the uk. No idea about T-Mobile
Sent from my Motorola RAZR via SMS
Click to expand...
Click to collapse
What operator and what frequencies of 3g?

stings70 said:
Called Verizon Global Support a few days ago and had them give me the SIM unlock code. Once unlocked I was able to insert a T-Mobile SIM card. I went to Settings>Call>Preferred Network and changed to GSM. I was able to make/receive phone calls on the T-Mobile network as well as connect to the Edge data service. I did however have to add the APN setting for T-Moble (epc.tmobile.com) to get Edge service.
Click to expand...
Click to collapse
How they gave your unlock code - did you by phone by _retail price_?

Does anyone know if it would be possible to only have T-Mobile US SIM handle only the calls & texts part, and Verizon data with the Pre-Paid $30. unlimited data?

NexusOneOwner said:
Does anyone know if it would be possible to only have T-Mobile US SIM handle only the calls & texts part, and Verizon data with the Pre-Paid $30. unlimited data?
Click to expand...
Click to collapse
Doesn't seem very likely, but honestly I don't know.

alisher said:
How they gave your unlock code - did you by phone by _retail price_?
Click to expand...
Click to collapse
You call Verizon. They verify that you've been a customer in good standing for 6 months or more, and they give you the unlock code. No charge. You can't unlock more than one phone per account per some period (13 months, or something like that). It doesn't matter if you have a contract term, etc. (you don't need to pay full retail for the phone).
Once you're unlocked, you can use a SIM from whatever carrier you choose. There have been reports that you can't use others in the US (AT&T, T-Mobile), but I've not tried that. I've had no troubles using a Cingular SIM in Europe.

Oops from my Incredible 2 using xda premium

does this method work for a us cellular customer? i have the electrify and plan to travel later this year. the whole idea for the world phone was to have it work there as well without the god awful international roaming.
i just use the *#*#4636#*#* code and put it in gsm/cmda auto? then how do i get it to recognize the sim when i get there?
i am using cm7

which an unlock code ( from Verizon - U have to unlock the first time ), Inc 2 can use GMS network ( both GPRS, Edge, 3G - HSDPA 900 / 2100 )
I'm using an unlocked inc 2 in Vietnam, with GSM network. It work well, both 3G and GPRS
PS : Using stock rom ( 2.3.3 ), AOKP and some other rom ICS doesn't work ( may be a part like sms doesn't work ).

FYI - being a VZW customer in good standing, I called up - using another phone line - Global Support & requested Sim unlocking, after verifying my identity - reading the disclaimer/emailing the disclosure docs, etc. & placing me on hold for a short while, came back & gave step-by-step instructions on inputting the 8 digit unlock code into the DI2 - the phone's screen displaying "unlocked" (it's good for life) then powered down & rebooted, and it was good to go.
I replaced the stock Vodafone SIM (note: it's not provisioned or activated) with an active China Mobile Sim card (that I normally used with an unlocked quad-band LG or Sony Ericsson "feature" phone) - turned off roaming data & mobile data access before switching over to GSM mode, and, it's success & ready - registered on AT&T's 3G network (CMCC's roaming partner, also with T-Mobile.)
I was able to send short codes to obtain my CM account balance, etc. (*#130# - Send for my overseas carrier)
Just returned from a weekend cruise to Bermuda (UK) trip and it registered with DigiCel for roaming on the island with GSM active only - (CellularOne is also available for roaming purposes) These are the same carrier for AT&T and T-Mobile Sims when going to this 21 miles island out in the Atlantic.
While on the cruise ship (Royal Caribbean) - it registered with their satellite based ship services for voice/SMS and GPRS (yes, it's slow 2G) services in GSM mode (it also worked in CDMA mode - beware of expensive Mobile Data pricing & per minutes calling rates ...)
FYI - back here on USA mainland now, prepaid AT&T Gophone & T-Mobile Sim cards worked on this unlocked DI2 (Edge/2G data only plus Voice/SMS) - it's easy to change APN settings to match AT&T or T-Mo if the account is provisioned for it - using both SkyRaider's custom ROM and Nijitsu's Sense ROM here.

P6 S - U06 known issues

Hi, I am an owner of this very nice smartphone, I'm very happy with it but there are a couple of problems that I'm not able to fix:
- it is sold as a 4G (LTE) phone for the sim card on the main slot and 3G on the second slot, it works only on 3G network for the main slot and 2G for the secon one
- an annoying metallic voice or strange noise when I receive or make a call from/to some numbers with a specific sim card (it's random but always the same numbers, I mean... not all numbers of a specific carrier but only some numbers of that carrier and never, till now, with other carriers).
It occours when that sim card is in the second slot (2G) or in the main slot and I force the 2G network on the main slot.
Did you experience the same problem?

spuntop said:
Hi, I am an owner of this very nice smartphone, I'm very happy with it but there are a couple of problems that I'm not able to fix:
- it is sold as a 4G (LTE) phone for the sim card on the main slot and 3G on the second slot, it works only on 3G network for the main slot and 2G for the secon one
- an annoying metallic voice or strange noise when I receive or make a call from/to some numbers with a specific sim card (it's random but always the same numbers, I mean... not all numbers of a specific carrier but only some numbers of that carrier and never, till now, with other carriers).
It occours when that sim card is in the second slot (2G) or in the main slot and I force the 2G network on the main slot.
Did you experience the same problem?
Click to expand...
Click to collapse
Which ever version of the phone that you get is not able to do 4G or LTE so thats a scam of the carrier and for the noise im not sure what can it be.
Sent from my SM-G850F

Vendor assured me that the phone can go in LTE... I must investigate which frequency use Vodafone in Italy.

spuntop said:
Vendor assured me that the phone can go in LTE... I must investigate which frequency use Vodafone in Italy.
Click to expand...
Click to collapse
And if you can search the web you can see for your self that P6 does not support lte in any way.
Sent from my SM-G850F

P6S does!
I'm talking about it, not P6.
Specs:
Dual Sim Yes, Full Active DSFA
2G GSM 850/900/1800/1900 Mhz
3G WCDMA 850/900/1900/2100 Mhz
4G LTE 900/1800/2100 Mhz
Slot Sim Card Dual Sim W+G/G+G - Micro Sim

spuntop said:
P6S does!
I'm talking about it, not P6.
Specs:
Dual Sim Yes, Full Active DSFA
2G GSM 850/900/1800/1900 Mhz
3G WCDMA 850/900/1900/2100 Mhz
4G LTE 900/1800/2100 Mhz
Slot Sim Card Dual Sim W+G/G+G - Micro Sim
Click to expand...
Click to collapse
You are wrong!
Link to GSM arena:
http://www.gsmarena.com/huawei_ascend_p6_s-5979.php

mojster666 said:
You are wrong!
Link to GSM arena:
http://www.gsmarena.com/huawei_ascend_p6_s-5979.php
Click to expand...
Click to collapse
Thats what I'm trying to explain all the time.
Sent from my SM-G850F

You are probably right and it isn't an LTE device... but for sure the specs on gsmarena are wrong when they say it is a dual sim dual standby.
It is dual active, I can receive calls on the second sim while I'm engaged on the first, hold this and answer on the second and vice versa.
On huawei.ru they say it is 3G, no P6S found on huawei.com.cn

Yes, you are right about dual sim specs. It is definitely dual active.
On GSM Arena are practically all phones dual sim standby. But this is wrong. However, we must admit the fact, that dual sim active phones are very rare.

No signal when switch to umts mode only GSM mode is working on HTC one m8

Hi team I bought unlocked HTC one m8 and for 1st week it was working fine but now suddenly it's 3g data is stopped working. I only able to use 2g data and when I switch to umts mode so it shows no signal and if I change to auto mode so it catch the 2g signal only. I tried my Sim in another phone so it's working fine and tried another Sim in my phone so I am facing the same problem. Guys please help as I really love this phone.

karan0405 said:
Hi team I bought unlocked HTC one m8 and for 1st week it was working fine but now suddenly it's 3g data is stopped working. I only able to use 2g data and when I switch to umts mode so it shows no signal and if I change to auto mode so it catch the 2g signal only. I tried my Sim in another phone so it's working fine and tried another Sim in my phone so I am facing the same problem. Guys please help as I really love this phone.
Click to expand...
Click to collapse
Hello,
I have reported this thread to be moved to right Q&A in order to get expertise help on the problem.
-Vatsal

karan0405 said:
Hi team I bought unlocked HTC one m8 and for 1st week it was working fine but now suddenly it's 3g data is stopped working. I only able to use 2g data and when I switch to umts mode so it shows no signal and if I change to auto mode so it catch the 2g signal only. I tried my Sim in another phone so it's working fine and tried another Sim in my phone so I am facing the same problem. Guys please help as I really love this phone.
Click to expand...
Click to collapse
Not enough info. Need the phone's CID, and what 3G (UMTS) bands used by your carrier.

redpoint73 said:
Not enough info. Need the phone's CID, and what 3G (UMTS) bands used by your carrier.
Click to expand...
Click to collapse
I Google and found this CID for my phone spcs_001. I got to know this from terminal emulator. Sorry but I don't know what band is used by my carrier.but I recently took 4g sim from my carrier which is working great on my brothers phone but not on my phone。I am using Airtel's 4g SIM and not able to use even 3g on it .

karan0405 said:
Sorry but I don't know what band is used by my carrier.
Click to expand...
Click to collapse
Call your carrier and ask them, they can answer this.
Nobody here can help you, if you don't give this simple information.

redpoint73 said:
Call your carrier and ask them, they can answer this.
Nobody here can help you, if you don't give this simple information.
Click to expand...
Click to collapse
Thanks, I have called my carrier and they advised that 2100 for UMTS (3G) and 2300 LTE (4g) band is used by Airtel.

karan0405 said:
Thanks, I have called my carrier and they advised that 2100 for UMTS (3G) and 2300 LTE (4g) band is used by Airtel.
Click to expand...
Click to collapse
You have the Sprint version of the phone (based on CID) which should be compatible with 2100 MHz (UMTS). This phone does not support 2300 LTE, but you may already be aware of that.
Are you sure your carrier's APN info is entered correctly?
You sure 3G worked for a week? Any changes that happened that could have have changed that?

Thanks for sharing this detail, I was not aware about the 4g which you mentioned. Yes my APN is correct and i have crossed checked with my carrier as well. And yes i have used 3g for a week and after that I took another SIM from my carrier(Airtel) 4g sim and just after that my 3g stopped working.
And I have checked my new sim in another phone so it's working fantastic but not in my phone. and I have checked my brother SIM in my phone so even that sim's 3g is not working on my phone. I could not understand all of sudden what went wrong which it stopped working.

karan0405 said:
Yes my APN is correct and i have crossed checked with my carrier as well. And yes i have used 3g for a week and after that I took another SIM from my carrier(Airtel) 4g sim and just after that my 3g stopped working.
Click to expand...
Click to collapse
Check the APN again, and that is the currently selected, active APN. All I can think, is that inserting another SIM changed the APN.

I checked again, but still same issue. What should I do any suggestion. Or could this be a software or hardware issue how to know this. Any idea

Data access on 2nd sim with 3 subscription

Was wondering if anyone here with a 3 subscription in Ireland or the UK can use data on the 2nd sim when abroad (with the 3 sim in slot 1)? I'm currently a 3 customer and had an LG G4 dual sim phone before and it wasn't possible to use 3G or 4G on the 2nd sim because 3 can't run on 2G or Edge. So the 3 sim always had to have data access enabled.

slonn said:
Was wondering if anyone here with a 3 subscription in Ireland or the UK can use data on the 2nd sim when abroad (with the 3 sim in slot 1)? I'm currently a 3 customer and had an LG G4 dual sim phone before and it wasn't possible to use 3G or 4G on the 2nd sim because 3 can't run on 2G or Edge. So the 3 sim always had to have data access enabled.
Click to expand...
Click to collapse
You can only have data access on one sim at a time. You can switch which sim has the data access but the one with data access will have 4g/3g/2g and the other sim will be 3g/2g. I use EE and Three in mine both are able to get a signal and use calls and texts. EE is the data sim on mine and Three can still make and receive calls and texts.

slonn said:
Was wondering if anyone here with a 3 subscription in Ireland or the UK can use data on the 2nd sim when abroad (with the 3 sim in slot 1)? I'm currently a 3 customer and had an LG G4 dual sim phone before and it wasn't possible to use 3G or 4G on the 2nd sim because 3 can't run on 2G or Edge. So the 3 sim always had to have data access enabled.
Click to expand...
Click to collapse
I used to have this problem with my dual sim HTC M8 - because only one sim could be run in 3G/4G.
Be reassured, I now can run a 3 sim happily as second sim, the OP3 allows the second sim to run in 3G.

Many thanks for the replies! Just wanted to make sure I can use the local sim for data access as the 3 Like Home option is not very good for data speed

Mi Mix2 and Axon 7 on Verizon

Mi Mix2 Global ROM MIUI 9 and Axon 7 Nov. 2017 Update.
Test condition - 1: Verizon post-paid SIM and Mint SIM (T-moible).
Mi Mix2: both sims can be in both sim trays. both can be active for voice call. obviously only one can be active on data. both sim gets LTE and VoLTE. when data is set to Verizon, Mint SIM connects as 3G (UTMS).
Axon 7: only tray 1 can work with Verizon SIM. both can work with Mint SIM. if put Verizon Sim on tray 2, no signal. both can be standby for voice. obviously only one line for data. when data is set to Verizon, MInt SIM connects as 2G (GSM). which might be problem for A&T as they already shut down 2G.
Test Condition -2: Verizon post-paid SIM and Xfinity Mobile (Verizon MVNO).
Mi Mix2: both trays can work. but only one can be active at one time, and looks like determined by data. when data is set to one of them, the other sim won't even get signal (shows emergency call only). but can switch between two sim back and forth no problem. so, not possible for dual sim voice standby with two CDMA lines
Axon 7: only sim tray 1 works with CDMA.

Will data still be connected when in a call using Verizon?
hhspiny said:
Mi Mix2 Global ROM MIUI 9 and Axon 7 Nov. 2017 Update.
Test condition - 1: Verizon post-paid SIM and Mint SIM (T-moible).
Mi Mix2: both sims can be in both sim trays. both can be active for voice call. obviously only one can be active on data. both sim gets LTE and VoLTE. when data is set to Verizon, Mint SIM connects as 3G (UTMS).
Click to expand...
Click to collapse
Thanks much for providing such a detailed comparison. I have a question regarding test condition 1. Hope to get some insights from you.
Assume that you set data to T-Mobile, and you are in a voice call using Verizon, is data via T-Mobile still connected? I ask this because phones such as Le Max 2 will have data disconnected when in a Verizon voice call.