Us Cellular Galaxy S3 on T-Mobile, AT&T, or other GSM Carrier? - Galaxy S III Discussion - TeamUSCellular

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Us Cellular Galaxy S3 on T-Mobile, AT&T, or other GSM Carrier?


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#1 mikerock

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Posted 25 April 2013 - 10:33 AM

I received the  letter in the mail saying that US Cellular in the Chicago Market sold to Sprint. I really do not want to use Sprint and i dont want to have to buy another phone.

 

Is there a way to use the US Cellular S3 on the T-Mobile network.? I know that the US Cell network is CDMA and T-Mobile is GSM. I also see the the S3 has a sim card slot.

 

According to this XDA thread it can be done.  http://forum.xda-dev....php?t=2036915 

 

Has anyone else done this? 

 

 

 

 



#2 RMarkwald

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Posted 25 April 2013 - 10:44 AM

I received the  letter in the mail saying that US Cellular in the Chicago Market sold to Sprint. I really do not want to use Sprint and i dont want to have to buy another phone.

 

Is there a way to use the US Cellular S3 on the T-Mobile network.? I know that the US Cell network is CDMA and T-Mobile is GSM. I also see the the S3 has a sim card slot.

 

According to this XDA thread it can be done.  http://forum.xda-dev....php?t=2036915 

 

Has anyone else done this? 

The USC S3 SIM slot is for LTE, and if it is possible, the best you'll be pulling is 2g (according to the link in Post #8 in your link:  http://forum.xda-dev...hlight=t-mobile) EDGE.

 

You'd have to follow the instructions (minus flashing Verizon's factory S3 image, use USC's instead) and see what happens.

 

EDIT:  There's USC people in the thread I linked you to that are still asking for help to get it working, and have tried the steps without success.


Edited by RMarkwald, 25 April 2013 - 10:47 AM.

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#3 iRub1Out

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Posted 25 April 2013 - 11:45 AM

You can't do it - it won't work - no matter what. We don't need another new topic on this.
 
The hardware is entirely different.  IF it worked at all the best you would get is voice, and data would be entirely dead.
 
Read here:
http://teamuscellula...s-cellular-faq/"]http://teamuscellula...us-cellular-faq
 
--this question is in BIG font and at the very top -- Along with the answer you needed --
 
 
INFO
 
VERY IMPORTANT:
No matter what you do to unlock a GSM/CDMA phone, they will ONLY work on a network with the same technology. So if you unlock a GSM phone, it will work on other GSM networks, but it will never work on a CDMA network (since there is no SIM card to put in the phone) and vise versa.
 
**There is one exception to this rule. Some CDMA phones are made to be used as a dual CDMA/GSM phone. This is sometimes called “World Capable” and is used simply because if you take your CDMA phone from the US overseas (where this is very little CDMA carriers), you would not be able to use your phone UNLESS the phone is dual GSM/CDMA. Popular phones that do this are usually clearly labeled as such.

These dual CDMA/GSM phones CAN have the GSM slot unlocked via an unlock code (just like a normal GSM phone) and then you can use it on a GSM network of your choice (and just not use the CDMA part of the phone) - meaning that you will most likely lose all working functions of the phone. You could lose data, sms, mms, voice...a dead phone.
 
GSM:
<>Uses a SIM card slot
<>Universal locking method means that all GSM locked phones have similar locks (which in turn means universal unlocking methods)
<>GSM uses a passcode to lock the phone to a particular network’s SIM card. The passcode is needed one time to unlock the phone and allow a different SIM card to be used.
<>The unlocking codes can be received from the manufacturer of the phone, or through a keygen program. This means the phone can be unlocked remotely with such a code.
<>CANNOT BE USED ON A CDMA NETWORK REGARDLESS OF IF IT IS UNLOCKED OR NOT
 
CDMA:
<>Does NOT use a SIM card slot*
<>Carrier information stored in the phone’s software. There is no built in locking software mechanism, so there is no simply unlocking method.
<>CDMA phones must be flashed in person using a cable in order to get it to use a different CDMA network.
<>You must find a CDMA flasher/unlocker (CDMA workshop) to flash the phone to a different CDMA carrier you wish to use. <--VERY illegal - ESN clone
<>CANNOT BE USED ON A GSM NETWORK REGARDLESS OF IF IT IS UNLOCKED OR NOT*
 
*SIM cards in CDMA devices are for international roaming - OR - LTE connectivity ONLY.  GSM SIM cards will not work in them.


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#4 iRub1Out

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Posted 25 April 2013 - 10:36 PM

OP, no issues with your question - hats a very good question, and I made it a sticky.

Now, to further explain:

Believe me, I wish like none other that we could do this. For a myriad of reasons.

I've read SO many blogs, threads, posts, everything I could find - because I wanted to be able to do it.

Workshops that clone ESN's are illegal, and you'll never gain equal quality to what even roaming on the original carrier would offer. Data would be sketchy, at best (if at all) - calls could be far worse than before, dropping and cutting out beyond the point of useful. SMS and MMS are possible, but MMS is a toss up, seems to be hit and miss.

So those possible issues (issues will be present, device/carrier combos will lessen or worsen the situation)

If were talking a gsm carrier, its a lost cause. You MIGHT get calls to go thru, but data, SMS/MMS will not work, there's not even a possibility of that since there's only one band for gsm that is present in a CDMA device (1900) - which is voice only (iirc) on gsm networks. Effectively making the phone a fancy mp3 player.

Now - all of the above is dependent on the user (you) somehow getting it to even function at all on the other network.

So the potential issues do suck, but simply getting some form of signal on another network, the method of doing so, and having the know how... Just SOOO not worth the effort or headaches of crap service. Not to mention the great risk of bricking it .

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S5 - S4 - S3 - EM - E2 - E1 - Moto X - Nexus 4 - iPhone 5S

 

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Let's eat, Grandpa!
vs.
Let's eat Grandpa!






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