Develop Bugs

[Q] Unlocked i927 on T-Mobile?

Hi,
I have just received an AT&T Captivate Glide i927 unlocked. I put my T-Mobile Monthly4G sim card in the phone, and can make/receive calls etc. as expected. I wasnt expecting to get 4G (I'm not sure the radio is capable of operating on TMobile's 4G?) but I only get Edge and no 3G.
I checked the APN settings and they are correct for TMobile.
Could someone advise what I may have set incorrectly? The phone should work at least on 3G, correct?
Thanks!

snigfargle said:
Hi,
I have just received an AT&T Captivate Glide i927 unlocked. I put my T-Mobile Monthly4G sim card in the phone, and can make/receive calls etc. as expected. I wasnt expecting to get 4G (I'm not sure the radio is capable of operating on TMobile's 4G?) but I only get Edge and no 3G.
I checked the APN settings and they are correct for TMobile.
Could someone advise what I may have set incorrectly? The phone should work at least on 3G, correct?
Thanks!
Click to expand...
Click to collapse
To partially answer my own question: perhaps the phone won't work on TMobile's 3G. The phone has HSDPA 850 / 1900 / 2100 frequencies, but the TMobile network has (according to Wikipedia):
1900 MHz UMTS/HSPA/HSPA+ 3G/4G
1700/2100 MHz UMTS/HSPA/HSPA+ 3G/4G[38]
1700/2100 MHz LTE 4G
Does this mean it would only work on 1900MHz or 2100MHz?
Will the Captivate automatically select the right frequency if it's available, for 3G/4G?
Thanks!

snigfargle said:
Hi,
I have just received an AT&T Captivate Glide i927 unlocked. I put my T-Mobile Monthly4G sim card in the phone, and can make/receive calls etc. as expected. I wasnt expecting to get 4G (I'm not sure the radio is capable of operating on TMobile's 4G?) but I only get Edge and no 3G.
I checked the APN settings and they are correct for TMobile.
Could someone advise what I may have set incorrectly? The phone should work at least on 3G, correct?
Thanks!
Click to expand...
Click to collapse
If it follows the bands of Apple's phones, your phone should at least get 3G(UMTS) when it does reach your area. The problem is that T-Mobile has not finished their upgrades.
Unless you really have to have 3G/4G, I'd wait until T-Mobile completes their conversion.

sethstorm said:
If it follows the bands of Apple's phones, your phone should at least get 3G(UMTS) when it does reach your area. The problem is that T-Mobile has not finished their upgrades.
Unless you really have to have 3G/4G, I'd wait until T-Mobile completes their conversion.
Click to expand...
Click to collapse
Thanks for this astute comment, which led me to e.g. this:
http://www.macrumors.com/2012/05/08...for-iphone-by-end-of-2012-lte-coming-in-2013/
Basically it seems that TMobile 3G/4G may start to work on the 1900MHz band by the end of this year, which would
mean the Captivate Glide would move off Edge and onto the higher speeds.

GS5 Europe Compatibility in the US

I'm not sure where I would post this exactly anyhow =p but I don't know much about antennas and such and what the US primarily uses for phone towers and 4g and all that. How well would the European version of the s5 work in the US? More specifically the G900K which is for Europe usage.
Some specifics for the euro s5:
Network:
LTE 800/850/900/1800/1900/2100/2600); UMTS (850/900/1900/2100MHz) ; GSM (850/900/1800/1900MHz)
HSPA (Download/ Upload) LTE Cat4 (150Mbps/50Mbps) / HSDPA+ 42Mbps / HSUPA 5.76Mbps / 3G / EDGE / GPRS

ReapersDeath said:
I'm not sure where I would post this exactly anyhow =p but I don't know much about antennas and such and what the US primarily uses for phone towers and 4g and all that. How well would the European version of the s5 work in the US? More specifically the G900K which is for Europe usage.
Some specifics for the euro s5:
Network:
LTE 800/850/900/1800/1900/2100/2600); UMTS (850/900/1900/2100MHz) ; GSM (850/900/1800/1900MHz)
HSPA (Download/ Upload) LTE Cat4 (150Mbps/50Mbps) / HSDPA+ 42Mbps / HSUPA 5.76Mbps / 3G / EDGE / GPRS
Click to expand...
Click to collapse
1st, this should have been posted in the Samsung Galaxy S5 q&a forum. It looks as if the radios are similar, but you cannot flash roms or any other software that are NOT designed for your phone. That's how bricks happen
sent from my G3

Well duh.. Wasn't planning on rooting. I'm just curious as to how compatible.. Don't want to get a phone with no 4g in the us

ReapersDeath said:
Well duh.. Wasn't planning on rooting. I'm just curious as to how compatible.. Don't want to get a phone with no 4g in the us
Click to expand...
Click to collapse
You will have to unlock the phone to use in the U.S. Also sometimes stock software is not always compatible in the U.S. You will likely have issues with text and mms messages because of incorrect apns, as well as 4g issues.
sent from my G3

joeyhdownsouth said:
You will have to unlock the phone to use in the U.S. Also sometimes stock software is not always compatible in the U.S. You will likely have issues with text and mms messages because of incorrect apns, as well as 4g issues.
sent from my G3
Click to expand...
Click to collapse
I know a company out of China where they unlock it and do all that stuff. Just need to figure out how well it works lol

[Q] Why does the ZF2 switch from LTE to 3G whenever I make a call?

Whenever I try to make a call using the default phone app on my ZF2, it always switches from an LTE connection, to H+/H, then settles on 3G, and also causes a delay in dialing. I'm currently using this on T-Mobile (USA), and I know T-Mobile supports VoLTE (HD Voice). Is this an issue of the ZF2 not supporting the band for VoLTE? (also is it possible to at least keep the call on H/H+ rather than 3G if the ZF2 doesn't support VoLTE)
I have the ZE551ML, 4GB RAM, 2.3 GhZ model.

itechnoguy said:
Whenever I try to make a call using the default phone app on my ZF2, it always switches from an LTE connection, to H+/H, then settles on 3G, and also causes a delay in dialing. I'm currently using this on T-Mobile (USA), and I know T-Mobile supports VoLTE (HD Voice). Is this an issue of the ZF2 not supporting the band for VoLTE? (also is it possible to at least keep the call on H/H+ rather than 3G if the ZF2 doesn't support VoLTE)
I have the ZE551ML, 4GB RAM, 2.3 GhZ model.
Click to expand...
Click to collapse
Its is not your phone. It is your carrier(T-Mobile). I have had the same issue with T-Mobile but did not have with at&t on the same unlocked phone. Kinda weird when it happens but doesn't seem to effect anything.

Recommend using ZenUI app called ASUS support/ There are several helpful tips with basic troubleshooting techniques for your device including 3G/LTE signal issues.
For online support please see ASUS ZenFone Quick Service and FAQ:
http://www.asus.com/us/support/self-service/11/
http://www.asus.com/us/Phones/ZenFon...esk_knowledge/
Sincerely,
ASUS_USA

As of now, phones must have software support for VoLTE, which only a few do. The ZF2 does not, that I know of.

dicktuggnutz4 said:
Its is not your phone. It is your carrier(T-Mobile). I have had the same issue with T-Mobile but did not have with at&t on the same unlocked phone. Kinda weird when it happens but doesn't seem to effect anything.
Click to expand...
Click to collapse
Let me reply, I'm working with telecom for 5 year plus and have been dealing elements of 2G > 3G >4G.
your scenario is actually one of the test cases during UAT( user acceptance testing), these test case are scenario based so from here i could say is that.
Your carrier may or may not support LTE call OR the counterpart may not have LTE call in (phone OR network).
This works by,
4G to 4G > depending on network ( if both carrier has VOLTE)
a) if both carrier has VOLTE( voice over LTE), assuming both phone are LTE enable phone then you shall stay onto 4G network and call should be packet based transmission
b) if both carrier has VOLTE assuming either phone does not have LTE enable, then you shall drop from 4G to 3G in order to support the call function of the other party
c) if both carrier has VOLTE assuming that either phone does not have the feature of attaching to LTE during call, it will drop to 3G network because phone is not designed to perform 4G calls. ( look at Xiaomi Redmi, similar scenario but 2G and 3G, during call, 2G call slot pick up and 3G is dropped)
TLDR: either your phone does not support simultaneous 4G call or the carrier does not support VOLTE.
Oh... most European and US telco is slower then asia's network, so they might not have VOLTE or currently test stage. 3GPP stated that by 2017, 2G network shall crease and everything build base as 3G hence 4G network is a must.
---------- Post added at 06:58 AM ---------- Previous post was at 06:53 AM ----------
sooty84 said:
Let me reply, I'm working with telecom for 5 year plus and have been dealing elements of 2G > 3G >4G.
your scenario is actually one of the test cases during UAT( user acceptance testing), these test case are scenario based so from here i could say is that.
Your carrier may or may not support LTE call OR the counterpart may not have LTE call in (phone OR network).
This works by,
4G to 4G > depending on network ( if both carrier has VOLTE)
a) if both carrier has VOLTE( voice over LTE), assuming both phone are LTE enable phone then you shall stay onto 4G network and call should be packet based transmission
b) if both carrier has VOLTE assuming either phone does not have LTE enable, then you shall drop from 4G to 3G in order to support the call function of the other party
c) if both carrier has VOLTE assuming that either phone does not have the feature of attaching to LTE during call, it will drop to 3G network because phone is not designed to perform 4G calls. ( look at Xiaomi Redmi, similar scenario but 2G and 3G, during call, 2G call slot pick up and 3G is dropped)
TLDR: either your phone does not support simultaneous 4G call or the carrier does not support VOLTE.
Oh... most European and US telco is slower then asia's network, so they might not have VOLTE or currently test stage. 3GPP stated that by 2017, 2G network shall crease and everything build base as 3G hence 4G network is a must.
Click to expand...
Click to collapse
and with that, our phone shall be non dual sim by 2017 onward which sucks.
it means that carrier will no longer allow BTS to attach 2G signal to BSC > MSS > circuit core.
so.... that slot is basically useless........ now.. lets wait for dual sim 3G/4G! perhaps zenfone 2^2

How can i switch to LTE/UTMS/GSM Mode with an unlocked US Cellular (US991) LG G4?

Hello people! I just got an Unlocked LG G4 (Factory GSM Unlocked) to use with any GSM/CDMA carrier.
I'm actually using a GSM network with this phones which uses 850/1900 UTMS bands for HSPA+ and Band 4 (1700/2100 AWS) for 4G LTE. I'm currently on a data plan so i need the LTE service and GSM as well. I'm facin issues to use both simultaneously with this phone because in Mobile networks settings i can choose between:
*LTE/CDMA
*UTMS/GSM
*GSM
When i select LTE/CDMA i can get DATA at LTE Speeds but i'm not able to make/receive phone calls, neither text messages or anything related to GSM/UTMS service. When i switch to GSM/UTMS i can make phone calls, text messages, also receive both of them and also use data but i get HSPA+ only. (3G).
What can i do to use both GSM/UTMS/LTE and the same time? Thanks for your help and your time people.

Anyone?

maxiordoqui said:
Anyone?
Click to expand...
Click to collapse
maybe try to set it on global?

Unfortunately I don't think there is anything you can do. I had a similar issue (trying to use a Verizon G4 on T-Mobile) nothing I did would allow calls, texts, and, LTE at the same time. In the end my solution was to trade my Verizon model for a T-mobile one. Maybe I was lucky, but finding someone willing to trade only took 3 days after putting an ad on Craigslist.
Edit: the Verizon model did have "Global" mode, but produced the same symptoms as you described. When LTE would show (happened very randomly on Global) I was unable to make/receive calls or texts. When calls and texts worked all I would see was HSPA or HSPA+.

Z2 force 2 models (Verizon, Sprint) and AT&T's upcoming 3G apocalypses

With AT&T shutting down it's 3G network in about 3 months (and t-mobile in 8 or 9) I was hoping I could get some feedback on getting AT&T's voLTE version (HD Voice) to work on the sprint and/or verizon Z2 force.
With the sprint/XT1789-03 Z2 force and an AT&T sim I do get the option for enhanced LTE services, but when calling LTE drops down to 3G for voice.
If I recall correctly when I tried to get AT&T service with voLTE on a Verizon/XT1789-01 there was no option for enhance LTE services on the stock rom (9/pie).
I did score a really nice AT&T/XT1789-04 pretty cheap, and of course it's voLTE/HD voice works fine on a AT&T sim, but I'd like to have the flexibility of using it on my other carrier branded Z2s.
Anyone else have any luck, seeing how the deadline will be here in a few months?
I appologize ahead of time if I missed this in my XDA searches, I tried to be thorough (I did find the sprint model with t-mobile hybrid flash but nothing conclusive for AT&T).
Thank you.