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babybuuutch

macrumors member
Original poster
Jan 16, 2012
41
0
I had a jailbroken iPhone 4 and used go phone on at&t today I switched to tmobile and now my sim won’t catch. I know I need to go into network and change the carrier but the network and apn doesn’t show up on my phone since it still thinks it’s on at&t. Anyone can help me out with this?
 

babybuuutch

macrumors member
Original poster
Jan 16, 2012
41
0
Is the iphone 4 unlocked?
If not then your tmobile sim wont work.
Only AT&T sims if its locked to them.

Yes it’s unlocked. The problem is that my phone still thinks it’s on the at&t carrier instead of tmobile, therefore giving me an invalid sim in the upper left corner.
 
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Applejuiced

macrumors Westmere
Apr 16, 2008
40,672
6,532
At the iPhone hacks section.
Yes it’s unlocked. The problem is that my phone still thinks it’s on the at&t carrier instead of tmobile, therefore giving me an invalid sim in the upper left corner.

That doesn't make any sense.
The phone doesn't just "think" its on AT&T.
Once you remove it and stick in a different sim nothing from the old carriers network stays there.
If its telling you invalid sim it is not unlocked.
Try restoring it and try to activate it with your tmobile sim.
If it doesn't activate and still tells you invalid sim then its not unlocked.
 
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