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So I'm writing this guide for SGH-I537 (ATT Samsung Galaxy S4 Active) users who want to use their I537 on T-Mobile or other carriers that support AWS (Advanced Wireless Services; see: http://en.wikipedia.org/wiki/Advanced_Wireless_Services).

Initially I got my I537 and heard conflicting reports of DIY SIM unlocking being successful, supposedly some people unable to get the AWS bands. So, I played it safe and got the device unlock code straight from ATT. Everything seemed to work at a cursory glance, got LTE and fast speeds, great! Little did I know that I actually did not have AWS unlocked.

In my room I get nearly no reception and rely on a repeater to get signal and be able to do basic things like SMS, make calls, etc. I noticed that for some reason the I537 was not picking it up.

ATT runs their LTE over some TMO HSPA frequencies (AWS) and the phone by default won't do HSPA on those frequencies. An AWS unlock will allow the phone to do either LTE or HSPA on these frequencies, thus allowing it to talk to my repeater.

I followed the guide at http://galaxys4root.com/galaxy-s4-tu...i337sgh-i337m/ but instead used the UMMS code of *#0808#

It works on the latest stock, unrooted ROM. My device was already SIM unlocked but I don't think that will make a difference for this process. I believe that one would require SIM unlock regardless, though, to use another network.

This guide unfortunately depends on Windows specific tools, so I had to use a Windows machine to do this. It's a pretty easy guide -- basically you tell the phone to expose its modem over USB, use a Qualcomm program to talk to it, do a backup of the NVRAM, and NV Restore someone's I337 NVRAM that has the AWS enabled.

It works perfectly for me and has worked for others as well (see comments on that guide). The only difference is we have to dial *#0808#

You may want to add the T-Mobile LTE APN as well:


Code:
Name : T-Mobile LTE
APN: fast.tmobile.com
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS Protocol: WAP 2.0
MCC: 310
MNC: 260
APN Type: default,supl,admin,dun,mms
(From http://forum.xda-developers.com/show....php?t=2236735)
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20th September 2013, 10:14 AM |#2  
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Mf3

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26th September 2013, 06:37 PM |#3  
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Sweet

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28th October 2013, 06:47 PM |#4  
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anyone else find their S4A sluggish on T-mobile (before or after) this?
28th October 2013, 10:33 PM |#5  
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Hi
Quote:
Originally Posted by mnasledov

So I'm writing this guide for SGH-I537 (ATT Samsung Galaxy S4 Active) users who want to use their I537 on T-Mobile or other carriers that support AWS (Advanced Wireless Services; see: http://en.wikipedia.org/wiki/Advanced_Wireless_Services).

Initially I got my I537 and heard conflicting reports of DIY SIM unlocking being successful, supposedly some people unable to get the AWS bands. So, I played it safe and got the device unlock code straight from ATT. Everything seemed to work at a cursory glance, got LTE and fast speeds, great! Little did I know that I actually did not have AWS unlocked.

In my room I get nearly no reception and rely on a repeater to get signal and be able to do basic things like SMS, make calls, etc. I noticed that for some reason the I537 was not picking it up.

ATT runs their LTE over some TMO HSPA frequencies (AWS) and the phone by default won't do HSPA on those frequencies. An AWS unlock will allow the phone to do either LTE or HSPA on these frequencies, thus allowing it to talk to my repeater.

I followed the guide at http://galaxys4root.com/galaxy-s4-tu...i337sgh-i337m/ but instead used the UMMS code of *#0808#

It works on the latest stock, unrooted ROM. My device was already SIM unlocked but I don't think that will make a difference for this process. I believe that one would require SIM unlock regardless, though, to use another network.

This guide unfortunately depends on Windows specific tools, so I had to use a Windows machine to do this. It's a pretty easy guide -- basically you tell the phone to expose its modem over USB, use a Qualcomm program to talk to it, do a backup of the NVRAM, and NV Restore someone's I337 NVRAM that has the AWS enabled.

It works perfectly for me and has worked for others as well (see comments on that guide). The only difference is we have to dial *#0808#

You may want to add the T-Mobile LTE APN as well:


Code:
Name : T-Mobile LTE
APN: fast.tmobile.com
MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
MMS Protocol: WAP 2.0
MCC: 310
MNC: 260
APN Type: default,supl,admin,dun,mms
(From http://forum.xda-developers.com/show....php?t=2236735)

Wen I get to Device Manager I dont see COM24 I see COM6 and COM7. Do you know what to do in that situation???
1st November 2013, 10:41 PM |#6  
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Quote:
Originally Posted by jci8926

Wen I get to Device Manager I dont see COM24 I see COM6 and COM7. Do you know what to do in that situation???

Try each. One of them should come up as the phone.
19th November 2013, 09:54 PM |#7  
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SIM Unlocked on T-Mobile in Orlando:

Before Samsung replaced my Active I was running MF1, this hack wouldn't work. They sent me a new replacement with MF3 Monday. This worked!! Places where I get "E" are now "4g"!!

Awesome! I was almost going to sell it for a Nexus 5 due to this problem but not anymore!
20th November 2013, 06:08 AM |#8  
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So I've gone through all the steps and now I am at the part where I add the APN but I can't seem to find the MMS Protocol section. I've also heard we should use fast.t-mobile.com instead of the fast.tmobile.com, would that matter??
20th November 2013, 03:37 PM |#9  
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Quote:
Originally Posted by xAjCx

So I've gone through all the steps and now I am at the part where I add the APN but I can't seem to find the MMS Protocol section. I've also heard we should use fast.t-mobile.com instead of the fast.tmobile.com, would that matter??

You don't have to manually add in the APN. T-Mobile will automatically configure it for you.

Out of the box a brand new S4 Active all you have to do is SIM unlock it and it will work amazing on T-Mobile. In order to get faster service in some areas that have not been converted, you need to AWS unlock those frequencies (upload the t-mobile s4 QCN file that changes a bit in the NVRAM to turn on that part of the radio as explained in that article).

That's it. Done. Now in most areas where you see "E" you'll get "4g". You'll also get better LTE coverage if your area has been converted.

Prior to this mod I did yesterday I was mostly seeing "E" with bits of LTE randomly especially on my commute to work. Made it really hard to listen to online radio. Now? LTE the whole way 20-25MBPS connection. Thank god for the $70 unlimited plan!
4th December 2013, 10:18 AM |#10  
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regionlock away really work ..I'm on mf3

Sent from my SAMSUNG-SGH-I337 using xda app-developers app
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