AT&T and T-Mobile

TG1

macrumors 6502a
Original poster
Feb 21, 2011
584
45
Guys,

If I buy an AT&T iPhone from ebay or Craigslist, can I use it on T-Mobile? I know they're both GSM carriers but I don't know what is involved in switching (unlocking, etc). Thank you.
 
Last edited:

Applejuiced

macrumors Westmere
Apr 16, 2008
40,672
6,404
At the iPhone hacks section.
Guys,

If I buy an AT&T iPhone from ebay or Craigslist, can I use it on T-Mobile? I know they're both GSM carriers but I don't know what is involved in switching (unlocking, etc). Thank you.
No.
If its locked to AT&T it wont work with Tmobile even though they are both GSM.
You need to get an unlocked iphone or if you buy one that's locked you can then purchase an IMEI unlock after.
 

Marcus72

macrumors member
Jan 31, 2009
98
5
Jeff Benjamin tweeted this about unlocking an AT&T phone:

The folks at @cellular_medic are legit. Instant unlock of my iPhone 4S was completed within a few minutes. http://cellular-medic.com/


I'm might do this for my mom's iphone4 but I wonder if I can lock again after unlocking.
 

Applejuiced

macrumors Westmere
Apr 16, 2008
40,672
6,404
At the iPhone hacks section.
Jeff Benjamin tweeted this about unlocking an AT&T phone:

The folks at @cellular_medic are legit. Instant unlock of my iPhone 4S was completed within a few minutes. http://cellular-medic.com/


I'm might do this for my mom's iphone4 but I wonder if I can lock again after unlocking.
No, once its officially unlocked with an IMEI service it will never lock again not matter how many times your restore or update the firmware.