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T-mobile New UICC 3G Sim cards

Was talking to the T-mobile rep about the gps issue and not locking in within secs as it did the first day of purchase. Went through some steps then he informed me that I have the older 2G Sim card and I needed to go to a Tmobile store to upgrade my sim card to the new UICC 3G sim cards. This is the first I ever heard of this as he said they were release back in January. Called the local T-mobile store and they confirmed it. So now i'm going to head to the store and see if it makes a difference. Wanted to know if anyone else has heard of this?
Jeffrey G: Now, I've noticed that you are still using an older version 2G SIM, though you have now been using 3G style phones.
_Jeffrey G: Last January we came out with a new version SIM card, called UICC 3G, because we've seen a lot of the 3G phones acting up with the older SIM cards.
Ange: how do you know the difference between a 2g Sim and 3G style sim
_Jeffrey G: Things like, freezing up, losing signal, not getting data signal, rebooting and bogging down.
_Jeffrey G: Well, some of the UICC SIM cards show UICC on it, though not all batches do. We can see it on the network side as it is listed as what type you are using.
_Jeffrey G: If you go to locator.t-mobile.com you can find the closest T-Mobile Corporate Store.
_Jeffrey G: Labeled with a pink "T" icon, there you can trade in your SIM and get the new SIM at no charge. We can even help transfer everything over for you.
Ange: will i still keep the same number
_Jeffrey G: Absolutely!

Soldi3rxx said:
Was talking to the T-mobile rep about the gps issue and not locking in within secs as it did the first day of purchase. Went through some steps then he informed me that I have the older 2G Sim card and I needed to go to a Tmobile store to upgrade my sim card to the new UICC 3G sim cards. This is the first I ever heard of this as he said they were release back in January. Called the local T-mobile store and they confirmed it. So now i'm going to head to the store and see if it makes a difference. Wanted to know if anyone else has heard of this?
Jeffrey G: Now, I've noticed that you are still using an older version 2G SIM, though you have now been using 3G style phones.
_Jeffrey G: Last January we came out with a new version SIM card, called UICC 3G, because we've seen a lot of the 3G phones acting up with the older SIM cards.
Ange: how do you know the difference between a 2g Sim and 3G style sim
_Jeffrey G: Things like, freezing up, losing signal, not getting data signal, rebooting and bogging down.
_Jeffrey G: Well, some of the UICC SIM cards show UICC on it, though not all batches do. We can see it on the network side as it is listed as what type you are using.
_Jeffrey G: If you go to locator.t-mobile.com you can find the closest T-Mobile Corporate Store.
_Jeffrey G: Labeled with a pink "T" icon, there you can trade in your SIM and get the new SIM at no charge. We can even help transfer everything over for you.
Ange: will i still keep the same number
_Jeffrey G: Absolutely!
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Wish that would have fixed my problems - I got a new SIM with this latest G2x.. It worked fine for 3 days then started the reboot tango just like the 3 before it.

Soldi3rxx said:
Was talking to the T-mobile rep about the gps issue and not locking in within secs as it did the first day of purchase...
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How can the gps issue be the sim card if it the same one you were using when phone was properly working.

sstang2006 said:
How can the gps issue be the sim card if it the same one you were using when phone was properly working.
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How can the speed at which the phone acquires a GPS lock be a SIM card issue AT ALL?

I have an older R20 SIM attached and I don't have much problem.

Well GPS will use cellular triangulation to help speed up the initial lock, which can take up to 2 minutes (cold lock vs warm lock).
AGPS uses cellular towers to help narrow down the search. GPS is basically a timestamp signal and satellite position. With multiple timestamps and satellite positions, it can calculate an almost exact position on the planets surface.
Typically GPS units with an active data connection can keep a cache of satellites and their orbits. If you have a rough position via cellular tower triangulation and a timestamp, you can greatly reduce of satellites that are supposed to be in the sky above and get a quicker fix on a location.
So technically, if your cellular is screwed up, you won't get a quick fix like most of us are used to (under 10 seconds). Before AGPS and all the new techniques, 2 minutes was normal under cold conditions.
Today, using CM7 #38, I used my GPS to try to navigate to a place I had never been. I was in the outskirts of a major city and had 3G/4G signal. I watched the clock for an exact fix. 2 minutes.
So either the AGPS isn't downloading and pre-caching information properly or there is a problem with triangulation to begin with... or both.
Some people have claimed that the default AGPS data servers are bonked and thus changing to another GPS server has yielded quicker response times. Others say the SIM has helped. Others have said their rom has helped (which may use different servers by default). I don't know. But anything is possible.
I do know that I was getting pretty quick locks when I first got the phone running stock. Perhaps it is another driver issue (Froyo vs GB). I don't think it is a hardware issue though and the locks, once locked, work pretty well and accurate. I'm leaning toward a software issue since there seems to be a few of them we are aware of... especially driver related.
BTW I'm using the SIM that came with the phone just for good measure.

Ok so let me clear a few things up here. I work in Tech Care/PDA Support and a new sim will not fix software slowness or lagging when switching programs. The only time I ever recommend a new sim is if there are drop calls, intermittent texting failures, data connection drops that are consistent, etc. This also isn't going to give you a faster data speed.
It doesnt hurt to make the switch, but that rep gave unrealistic expectations.

CyanogenMod 12.1 - D850 - No LTE

I seem unable to get LTE on my D850 since I installed CM12.1 and was wondering if this is common for this ROM. I installed the nightly, so I assume its obviously going to be a bit buggy, but to not have LTE working seems strange.
I checked my APN and I tried both ATT LTE and ATT Phone. The ATT LTE gives me a status bar with an exclamation point and never establishes a data connection and ATT Phone gives me HSPA connectivity. At one time, I waited a few hours and it eventually established LTE but that was an uncommon occurrence and its never been repeated since.
With other ROMs I have not seen this issue replicated. I tested on Cyanide L, Euphoria, and the Stock LG ROM and everything worked fine. Any suggestions?

Hey there,
I'm running CyanideL myself, love this ROM.
Which nightly version are you using?
Have you checked that Mobile Networks --> Preferred network type.... is set to LTE?
Have you tried toggling to 3G, getting a connection, then moving back to LTE?

I also have this problem. Has a solution been found?
I just ditched the stock ROM and installed CM12.1 a few days ago. Now LTE has disappeared. I had it, now can't get it. I'm not able to select LTE in the settings→Mobile networks→Preferred network type menu, nor can I select any option that includes LTE in the test menu (*#*#4636#*#*). It's probably some stupid user error, but whatever it is has been eluding me for a day of messing with it.
Presently running cm-12.1-20150804-NIGHTLY-d850.

wseverin said:
I also have this problem. Has a solution been found?
I just ditched the stock ROM and installed CM12.1 a few days ago. Now LTE has disappeared. I had it, now can't get it. I'm not able to select LTE in the settings→Mobile networks→Preferred network type menu, nor can I select any option that includes LTE in the test menu (*#*#4636#*#*). It's probably some stupid user error, but whatever it is has been eluding me for a day of messing with it.
Presently running cm-12.1-20150804-NIGHTLY-d850.
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Interesting...
Have you tried restoring your stock ROM and seeing if it will connect? How about a SIM card pull?

Have you tried restoring your stock ROM and seeing if it will connect? How about a SIM card pull?
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Click to collapse
Thanks for the reply. I have not tried returning to the stock ROM. I just got all my apps reinstalled and data restored, widgets installed, screens set up, etc., so I'm not too keen on doing all that again so soon.
I have tried a chicken SIM card pull. I was somewhat fearful of doing a pull "hot" as is usually suggested. I powered down, removed the SIM card, and restarted. After restart, I was able to select LTE in the settings→Mobile networks→Preferred network type menu, and the test menu confirmed that LTE/GSM auto was the preferred network type.
I then powered down, re-installed the SIM, and restarted. After restart the preferred network type had been reset to 3G and I was (am) unable to select LTE.
My conclusion is that this is something to do with the Net10 SIM I'm using. I've ordered a new SIM from Net10. The Net10 rep says a new SIM may fix things. One is on it's way and should be here in a few days. I'll post the result.

[SOLVED]
My new "LTE capable" Net10 SIM arrived today. I had Net10 customer service transfer my service to the new SIM. Now I have LTE; I'm able to select LTE in the Settings→Mobile_Networks→Preferred_Network_Type menu, LTE appears in the CM12.1 status bar, and I'm able to make a solid LTE connection.
I will here piece together everything I've learned from my own experience, Net10 customer support, and internet searching. My conclusion is that there are TWO compounding problems for Tracfone/Net10/StraightTalk users. One is techhnical and the other is marketing.
The technical issue is that all Net10 (also Tracfone and Straight Talk) AT&T SIMs sold up to a couple of months ago don't work with LTE on the AT&T network. That's most of the AT&T SIMs from these companies out there in the world today. This is not widely known – in fact, most of the Net10/TF/ST customer service reps are not aware of it. It's not something that Tracfone and its subsidiaries want known because it would cost them a bundle replacing SIM cards for unhappy customers. If you have a Net10/TF/ST SIM that's more than a few months old, you have to call Net10/TF/ST and buy another new one that's compatible with AT&T LTE if you want LTE service.
So, why don't more Net10/TF/ST AT&T users raise a fuss and demand LTE capable SIMs? That brings us to the marketing issue.
AT&T lies. So do Tracfone and its subsidiaries. AT&T markets its HSPA+ 3G service as 4G when it's not. In fact, the AT&T stock ROMs that most people are using lie. The stock ROMs display 4G or sometimes 4GLTE (depending on ROM version) in the status bar when in fact it's a HSPA+ connection; not 4G let alone LTE. So users cruise along using their old SIM cards happily thinking they have 4G or LTE connections when in fact they do not; and they're none the wiser. It's only more sophisticated users who flash a 3rd party ROM, one that doesn't lie, who figure it out.
(solution cross posted to similar thread at http://forum.cyanogenmod.org/topic/113404-cant-select-preferred-network-type-lte/)

GS7 (G930U) with Freedompop, cannot get LTE connection.

I have been battling with this no LTE case for this Galaxy S7, BYOD. This is the official US unlocked version, and works with Sprint (on their whitelist), furthermore, my wife has the same phone rocking LTE with FP right now (BYOD as well, so on sprint network), so it's compatible with FP's service.
My understanding for FP byod (based on previous exp) is that if the phone was activated on Sprint network before, the MEID and the ICCID info is stored together, so even if BYOD process only ask for MEID, as long as you have the previous activated SIM, the ICCID info get carried together, so you normally would have no problem getting LTE.
This Phone was never activated on Sprint before, so when I first activated it BYOD, so no previous SIM info, but I plugged in a compatible SIM that was activated on Sprint network before (with another MEID though). My initial activation had problem (red bar on my account summary), had to email customer service to add this ICCID. Phone passed the hands free activation and all. No problem using the fp apps, phone, sms, cellular network worked (only 3G).
I then started to do all kinds of reset trying to get LTE connection. I have done,
1.##72786# carrier reset
2. Restore APN setting to default, clear cache, reboot
3. Matching all the LTE related parameter with a known LTE connected phone (my wife's GS7)
4. factory reset
5.Deactivate and then reactivate the GS7 (by swapping devices between two fp accounts)
Now almost three months now, I'm still facing the same issue. FP customer service has been helpful doing the routine checks, but not beyond the suggestion of PRL update/reactivation. The final solution they offered was to deactivate the account and the activate the GS7 with another byod account. I did this just today, by swapping another device in this account, and then reactivate the GS7 to that account.
My very first concern is if the ICCID info has been accurate (not missing or mistaken a digit), but I asked them to verify this at least three times, nothing came back as error.
Compared to my wife's same GS7 with fp, my phone is rather slow to establish the 3G mobile data connection, for example, her phone would almost show LTE instaneously after a reboot, but my phone would be at least after a min to show the 3g icon.
Can someone share some insights on what else I could do? I just could not think of anything else from my phone side to do. A note worthy thing is, when I helped BYOD my wife's GS7, I was in the same boat of needing to add ICCID via customer service to pass HFA, and then all the reset to get the LTE. I actually wasn't able to get LTE connection by what I did, shut off the phone with 3G connection, but next morning I turned on the phone, LTE was there. Along with me, I saw multiple users who had similar no-LTE problem report they were getting LTE same day.

procter said:
I have been battling with this no LTE case for this Galaxy S7, BYOD. This is the official US unlocked version, and works with Sprint (on their whitelist), furthermore, my wife has the same phone rocking LTE with FP right now (BYOD as well, so on sprint network), so it's compatible with FP's service.
My understanding for FP byod (based on previous exp) is that if the phone was activated on Sprint network before, the MEID and the ICCID info is stored together, so even if BYOD process only ask for MEID, as long as you have the previous activated SIM, the ICCID info get carried together, so you normally would have no problem getting LTE.
This Phone was never activated on Sprint before, so when I first activated it BYOD, so no previous SIM info, but I plugged in a compatible SIM that was activated on Sprint network before (with another MEID though). My initial activation had problem (red bar on my account summary), had to email customer service to add this ICCID. Phone passed the hands free activation and all. No problem using the fp apps, phone, sms, cellular network worked (only 3G).
I then started to do all kinds of reset trying to get LTE connection. I have done,
1.##72786# carrier reset
2. Restore APN setting to default, clear cache, reboot
3. Matching all the LTE related parameter with a known LTE connected phone (my wife's GS7)
4. factory reset
5.Deactivate and then reactivate the GS7 (by swapping devices between two fp accounts)
Now almost three months now, I'm still facing the same issue. FP customer service has been helpful doing the routine checks, but not beyond the suggestion of PRL update/reactivation. The final solution they offered was to deactivate the account and the activate the GS7 with another byod account. I did this just today, by swapping another device in this account, and then reactivate the GS7 to that account.
My very first concern is if the ICCID info has been accurate (not missing or mistaken a digit), but I asked them to verify this at least three times, nothing came back as error.
Compared to my wife's same GS7 with fp, my phone is rather slow to establish the 3G mobile data connection, for example, her phone would almost show LTE instaneously after a reboot, but my phone would be at least after a min to show the 3g icon.
Can someone share some insights on what else I could do? I just could not think of anything else from my phone side to do. A note worthy thing is, when I helped BYOD my wife's GS7, I was in the same boat of needing to add ICCID via customer service to pass HFA, and then all the reset to get the LTE. I actually wasn't able to get LTE connection by what I did, shut off the phone with 3G connection, but next morning I turned on the phone, LTE was there. Along with me, I saw multiple users who had similar no-LTE problem report they were getting LTE same day.
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Hi mate
Maqybe here they can help you better , this section is for the exynos model

Thread closed.
Please continue the discussion here: https://forum.xda-developers.com/sprint-galaxy-s7/help/g930u-freedompop-lte-connection-t3619028

Very Interesting Find (Semi-Swappable SIM on CDMA Network?)

Hello XDA, I made this account to post this interesting find I've been experiencing (and enjoying) for the past month. I am with US Cellular as my carrier at the moment, as it serves me best for my uses and my area. I recently decided to "upgrade" my phone to a Galaxy A50 due to deteriorating battery life of my S8, as well as just wanting to get my feet wet with a bigger device. As with all of my new devices, I use ADB as well as a package manager to disable all of the bloatware and such that comes on my carrier's device, so out of curiosity while moving my SD card over I decided to put my fresh SIM, new ICCID, straight out of the box in my A50, in my previous S8. I noticed mobile data working, which didn't seem like a big deal to me since I'd seen it happen before.
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Just for s**** and giggles I decided to make a test call. The call went through working as it did while my S8 was active. I was pretty majorly confused by this, as I had tried the same thing in the past with older devices and it hadn't worked. I had thought maybe VoLTE was the cause of this, so I decided to send an SMS, MMS, and also make a call with Enhanced Calling off. Everything worked great, and I was pretty happy yet confused.
I can now swap the SIM between the two phones, and find myself using my S8 for tethering more frequently due to faster LTE speeds (about 1.5x faster) than my A50.
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I have since migrated to a completely different US Cellular account (albeit same phone number), not just a new plan but a whole new account with the A50 being on the new account, and swapping the SIM still works. Has anyone else experienced the same type of thing on any other CDMA networks in the US? If so, is there a way to replicate it with previous devices, or have I just got lucky with a massive bug in the system?

AT&T will not support my unlocked device

Pardon my noobness, I will explain this to the best of my abilities
AT&T told me that my current phone Samsung S8+ will not work on their network (international dual sim unlocked version). They said that it is because "the 3G will shut off" but this phone is clearly a 4G phone. To be more specific, my device is a SM-G955FD. They sent me a replacement phone which is less than crappy and said my current sim will be deactivated soon.
I have already rooted (and ROM'ed) my phone - and I know you can change device identity/fingerprint using build props. I want to mask my phone as a SM-G955FU which is the USA unlocked version. At this point, I'd like to know if this could make a difference and make my phone not be deactivated by fooling their system, or if there are other things to try.
List of permitted phones
https://www.att.com/idpassets/images/support/wireless/Service-Capabilities-Unlocked-Devices-ATT-Network.pdf
Help appreciated,

I don't think they query device's brand / model property as stored in Android's build.prop file because these characteristics at any time can get changed by user.
The speed of data access relies on two things: your phone and your service provider. Every phone has a radio module that is responsible for talking to the network. It is this piece of hardware that either can or can not use latest communication technologies: if the phone does not support 4G, you will not get that speed whatever you try.

jwoegerbauer said:
I don't think they query device's brand / model property as stored in Android's build.prop file because these characteristics at any time can get changed by user.
The speed of data access relies on two things: your phone and your service provider. Every phone has a radio module that is responsible for talking to the network. It is this piece of hardware that either can or can not use latest communication technologies: if the phone does not support 4G, you will not get that speed whatever you try.
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Thanks, what is odd is that it should support it on several bands
Will Samsung Galaxy S8+ work in USA?
In this page we are going to show you the compatibility of Samsung Galaxy S8+ with the mobile networks of USA and with the telephony operators that provide service in USA.
www.kimovil.com

The same thing happened to me today, woke up to a sim not registered message and no cell service (voice, sms or data).
I went to the store and they said my unlocked Moto G7 Power (XT1955-2) is not supported/compatible on ATT's network. I re-checked the phone's specs and it supports 4G LTE on bands 12 and 17 on 1900 Mhz which overlaps the data I found for ATT's network. I'm not well versed in this stuff tho. Perhaps it's a local towers thing and I am in an area where their towers are operating on the other ATT frequencies (1700, 700)? The guy at the store did something (I forget the exact details) and I do have voice back, but that is it, no data or SMS. He also mentioned that ATT is like cracking down on what kind of devices can connect. If ATT is blocking my device tho I'm curious, how is it possible? I guess they can lookup my device via the IMEI and then see if it's on their approve list of devices?

I don't understand their problem. Your phone model is listed as supported as long as you update your software to enable WiFi calling (VoLTE). Come 2/2022, you phone must either be 5G or VoLTE calling enabled to be supported. My Xiaomi Mi Mix 2s shows that it can do VoLTE under the sim card details in Settings and supports 13 LTE bands, including AT&T's bands. It should continue to work on their network after 2/2022.
Yet AT&T repeatedly disabled my phone. I had to tell them to re-activate my phone multiple times. I have tried some new phones. Turned out everytime I pulled the sim out to try a new phone and stick it back in my old phone, AT&T would check the phone's IMEI again and would disable the phone. On the 5th call with them, they put in a code/note in their system to mark my IMEI (be ware each sim tray has its own IMEI) not to be disabled until Fed 2022. I have since tried Surface Duo which on this list and decided not to keep it. Stuck the sim card back in my old phone specific sim tray and it continues to work.
Call them to re-activate/keep your phone active until Fed 2022. They have no rights to disable your phone before then.
Most A&T reps understand less than us on the reason to disable our phone. They jsut keep saying 3G phones will be disabled but our phoens are clearly LTE. VoLTE is one real reason of the problem but them our phones support VoLTE anyway. I am tired of arguing with them and am looking at a Note 10 now. But your situation got me concerned. Sounds like they may not honor the supported list which is updated frequently. I downloaded the June version of the list which is largely the same as yours and asked them how long they would support the phones on the list. They couldn't/wouldn't commit. Even on the phones they sell at their website, they would only give a vague promise to support them for "quite a while".
AT&T has always advertized BYOP. We spent big money on nice phones that are compatible with their network. And now the want to shut us out.