Develop Bugs

Can I force roaming on tmobile network with an at&t sim card?

Hi everyone,
I recently obtained an AT&T sim card and installed it into my unlocked and rooted tmo g2. I was under the assumption that I would be able to at least get 3g on the AT&T network with my phone, but did not realize that the g2 does not support the frequency bands for at&t 3g. I currently only get 2g/edge, data is slow and calls are sketchy.I have all the apn's setup correctly, I know I do. The phone simply does not support the frequency for 3g.
I was wondering if I can force my phone to always roam on the tmobile network somehow so that I can obtain 3g or even by some stroke of luck 4g. I have national roaming so there is no charge.
Is This Possible???
Somebody please help me figure this out or tell me why it will not work.
XDA is a genius pool, somebody out there knows...
Thank you in advance
Sent from my HTC Vision using xda premium

You can use AT&T's network with a phone that has an unlocked sim slot, but AT&T's 3G band (same band Canada Bell 3G is on) is different from T-Mobile's, as a result you won't be able to use 3G on AT&T's network.
The same is true if you bought an international Desire-Z and tried to use a T-Mobile Sim, no 3G speeds on T-Mobile, but 3G with an international GSM/HSPA carrier.
PS: The G2/DZ does not support 4G, the only time you ever seen 4G in the indicator is when the phone is on HSPA mode (kind of in between 3G and true 4G speeds).
In a nutshell, a T-Mobile G2 will ONLY be able to get 3G and faster on T-Mobile's Network.
----- The above mainly for people coming in wondering the difference ----
In regards to force roaming with T-Mobile's network, as far as I am aware the two have a limited pairing arrangement, with a AT&T Sim, you would get minimum edge speeds with T-Mobile. (ie: why would a competitor give you more than just basic service). ie: you're not a T-Mobile Subscriber, as such you'll only get Edge (if any data at all) when roaming outside of AT&T's coverage.

Does the international Note 2 work on Sprint's Network?

Wanting to pull the trigger over at handtec, but do you know if the Note II will work on Sprint's network here in the states? If it's 3G only that's fine as the 4g/LTE isn't in my area yet anyways. And will not be until next year in which I would just upgrade to the Note 3.

It won't work on any of Sprint's networks, 3g or otherwise. You'll need to wait for Sprint to release it themselves.

Neither will it works on Verizon network. Both Sprint and Verizon use CDMA for voice, 2G and 3G data. Since the international version of GN2 won't have the CDMA chip in it, it won't be able to use the CDMA network.

AT&T LTE

I have the North American 64gb Zenfone 2. I use AT&T's Share plan and I registered my phone in AT&T's system and it refuses to give me LTE. AT&T claims LTE is enabled on my sim but it doesn't work. When I pop in my brother's sim from an AT&T locked device I get LTE. I do not have any other AT&T locked devices in my house as I recently switched. Can anyone help please??

I am having the same kind of situation with Cricket which is owned by AT&T. My SIM had LTE with my LG Optimus G Pro but only 4G with my ZF2. It is the exact same SIM.

Im on straightalk i used a att sim with no issues on my NA asus zenfone 2, had perfect 4G(lte) signal on 06610.

Trotter516 said:
I am having the same kind of situation with Cricket which is owned by AT&T. My SIM had LTE with my LG Optimus G Pro but only 4G with my ZF2. It is the exact same SIM.
Click to expand...
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If the indicater says "4g" that is LTE

OK, cool. My OGP showed LTE when it had the signal. I guess I was expecting the ZF2 to show the same.

APN settings for LTE on AT&T
nscian12 said:
I have the North American 64gb Zenfone 2. I use AT&T's Share plan and I registered my phone in AT&T's system and it refuses to give me LTE. AT&T claims LTE is enabled on my sim but it doesn't work. When I pop in my brother's sim from an AT&T locked device I get LTE. I do not have any other AT&T locked devices in my house as I recently switched. Can anyone help please??
Click to expand...
Click to collapse
Newbie, here - cannot post links.
Do a YouTube search for:
How To Setup AT&T LTE APN Settings
Hope this helps.

nscian12 said:
I have the North American 64gb Zenfone 2. I use AT&T's Share plan and I registered my phone in AT&T's system and it refuses to give me LTE. AT&T claims LTE is enabled on my sim but it doesn't work. When I pop in my brother's sim from an AT&T locked device I get LTE. I do not have any other AT&T locked devices in my house as I recently switched. Can anyone help please??
Click to expand...
Click to collapse
Visit your nearest AT&T store and get the rep to delete your ZF2's IMEI from their system. If they won't allow you to, borrow someone else's phone and **get another SIM card** from them. Modifying your APN settings won't help at this point.

Trotter516 said:
OK, cool. My OGP showed LTE when it had the signal. I guess I was expecting the ZF2 to show the same.
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I think the phone only shows 4g.. My Nexus 4 (wth LTE Radio) shows LTE..
I am also using Cricket and my phone shows 4G symbol, with speedtest.net I get the 8Mbps down (Cricket caps 4g at that).
When I popped in my t-mobile sim (from the Nexus 4) it also showed 4G symbol, but i would get 26-34Mbps down (which is the 4G/LTE speed)

VS986 to use band 5 LTE abroad.

I meant to use band 5 lte in indonesia with smartfren using vs986. I used shortcut master lite app to enable band 5 (and/or disable irrelevant lte bands). However i still cant connect to it. I am certain that my location is under that lte band 5 coverage given that when i used other gsm sim i could see the network and attempt a registration on the network. Furthermore, seeing the networks rat id also match with the information online that it is indeed a band 5 lte network. However when i pop in the band 5 lte network gsm sim card, i am no longer able to scan for networks, it just fails to scan everytime, thus i cant connect. I wonder if there is a workaround to make vs986 able to connect to other lte networks other than verizon.
P.s. im on slim 13b rooted/xposed.

It's not just the bands. Verizon really borked the firmware of the phone to make sure that it doesn't work on any other 4G LTE network than its own. For instance, it doesn't work on AT&T and T-Mobile LTE network in the US either, even though the bands are supported.
What you can try is to switch the phone to "LTE/CDMA" mode in the "Network mode" settings. This will probably kill your phone connection, but if you get 4G LTE then, then you can try the same hack that worked for T-Mobile: http://forum.xda-developers.com/verizon-g4/general/guide-fix-vs986-dropping-to-3g-h-4g-lte-t3272434
But on some networks, there is no hope, for instance nobody was able to get it to work on AT&T.

I think i did check that thread out when i used t-mobile for about 6 months in seattle/udistrict/uvillage/uw areas, with no success. I never got the LTE connection. I wonder maybe its related to different roms/kdz/flashfire modified version of 13b that cause it. I hope someone whos lucky enough to get lte might share info about their 13b version/softwares that you debloat using debloater or froze using tibu. Thanks.
P.s. it was on 4g for an instant before it gives me no signal/network.

Why would VZW disable B5 if they have B5 sites?
That would really be stupid.
Posted using a calculator and delayed by AT&T.

LTE 2/4/5/13 can be activated using Shortcut master lite. The problem is that, when i used a simcard that utilized LTE band 3/8, i could detect/attempt registration to signal from LTE band 5 from local network through GSM (given that i activated it). However when I used simcard for that LTE band 5 network, somehow, i can no longer use gsm/cant search for network/crashed. It seemed that LTE antennae on this device is programmed to only accept verizon's. (For lte networks, apns are saved when i put MCC/MNC or RAT for verizons, but discarded when i put other). Thank god though i could still use umts/3g.
Edit: So i tried again. Turns out, i could to get registered on the network, checked on network type and strength (says 4g - 3/4 bars) also on lte discovery says connected. However signal bars says unable to connect to network. Verizon definitely prevent users to use lte on another network. What a **** company.

this is from Verizon website them self
Network
CDMA, GSM, LTE*
Frequencies
1.9 GHz CDMA PCS, 800 MHz CDMA, GSM 850/900/1800/1900 MHz, LTE 2/4/5/13, LTE 3/7 for Roaming*
which show it support band 3 in case of romaing only..but if you are in USA will not work sure as it is not romaing.

Issue connecting to 4G

So a mate has a P2 and can't seem to get it to connect to 4G. The SIM card and network is Vodafone UK.
What I know/have tried:
- SIM in both sim slots will connect to 3.5G (HSDPA) on Vodafone network
- A different SIM (Three UK) did connect to 4G in the SIM slot 1 (did not try SIM slot 2)
- Settings says 4G preferred network is selected
- By typing *#*#4636#*#* into dialer and going to phone info displays LTE is selected as one of the preferred networks
- The same SIM (Vodafone UK one) connects to 4G in his old phone and has done in all his old phones
- APN settings are correct, verified by Vodafone support plus myself looking online
So he talked to Vodafone support again today who said try speed tests in 3 different locations and report back. He has done 1 which is 14mbps down and 3mbps up which is slow for 4G (I get 64mbps down and 24mbps up, different network but shows his is slow and likely not 4G). Similarly we we know the device can connect to 4G from using the Three UK SIM.
My gut instinct is it's a network issue, all device settings seem okay, nothing is screaming out of place. The issue though is that the SIM has connected to 4G in his other devices so confuses me.
So, I'd love your thoughts and inputs on this. Any suggestions welcome that may help! Thanks!

matt4321 said:
So a mate has a P2 and can't seem to get it to connect to 4G. The SIM card and network is Vodafone UK.
What I know/have tried:
- SIM in both sim slots will connect to 3.5G (HSDPA) on Vodafone network
- A different SIM (Three UK) did connect to 4G in the SIM slot 1 (did not try SIM slot 2)
- Settings says 4G preferred network is selected
- By typing *#*#4636#*#* into dialer and going to phone info displays LTE is selected as one of the preferred networks
- The same SIM (Vodafone UK one) connects to 4G in his old phone and has done in all his old phones
- APN settings are correct, verified by Vodafone support plus myself looking online
So he talked to Vodafone support again today who said try speed tests in 3 different locations and report back. He has done 1 which is 14mbps down and 3mbps up which is slow for 4G (I get 64mbps down and 24mbps up, different network but shows his is slow and likely not 4G). Similarly we we know the device can connect to 4G from using the Three UK SIM.
My gut instinct is it's a network issue, all device settings seem okay, nothing is screaming out of place. The issue though is that the SIM has connected to 4G in his other devices so confuses me.
So, I'd love your thoughts and inputs on this. Any suggestions welcome that may help! Thanks!
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I dont know the device or network specifically But I know that the device has to support the same lte bands that the carrier broadcasts in LTE in that area Just because the carrier broadcasts say 900mhtz in LTE, if the device dont support 900 in lte then it wont get it. I have had cases wher 3g is the same freq as 4g it still wont pick it up If you get what I am saying. May be a issue or not.

to further add he might take one of the old devices and use a signal catching app to see what lte bands are broadcasted in his area then compare to device

Thanks @TheMadScientist, all suggestions welcome still. I'm gunna continue to keep an eye on this, research answers and send him a link to this so he can test anything on the device.

matt4321 said:
Thanks @TheMadScientist, all suggestions welcome still. I'm gunna continue to keep an eye on this, research answers and send him a link to this so he can test anything on the device.
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Click to collapse
We get this issue a lot using sprint phones unlocked international gsm. A lot of carriers seem to not use the same lte bands.
Then naturly verizon devices come gsm unlocked but verizons radios are crap and do not pick anything up half the time. My veriz g5 can get lte next town over cause they use a supported band and no towers near me use it. So i get 3g. And a lot of h h+ i ise lte discovery as the app on mine.
Just hope this isnt his issue as its a harware compatibility .

TheMadScientist said:
We get this issue a lot using sprint phones unlocked international gsm. A lot of carriers seem to not use the same lte bands.
Then naturly verizon devices come gsm unlocked but verizons radios are crap and do not pick anything up half the time. My veriz g5 can get lte next town over cause they use a supported band and no towers near me use it. So i get 3g. And a lot of h h+ i ise lte discovery as the app on mine.
Just hope this isnt his issue as its a harware compatibility .
Click to expand...
Click to collapse
So I checked the network and the device (on GSM arena) and it seems 4G bands are supported. But I'll try that lte discovery app with him soon you mentioned and see what results that yields

@matt4321
http://www.techadvisor.co.uk/how-to...r-phone-is-supported-by-your-network-3597426/
You should check the manuals if there is support for 2600 frequency on phone.
Maybe the phone supports 800/1800(cos 3 is on 1800) and you don't have 800 band in area.
You will have to contact Lenovo and ask them to change baseband or whatever...
or Perhaps get a new phone with support for 2600

Had the same problem using a LG G3. I tried this App to trigger LTE only. Then the Phone connect to the LTE network.
https://play.google.com/store/apps/details?id=com.tapbase.LTEswitcher&hl=de