Looking to Unlock ATT contract phone for TMobile, do I first activate with ATT? Help!

[SilentLight]

I'm trying to figure out whether I need to first activate my new iphone 4 with the At&T sim that will come with it (its a contract phone my brother is buying for me), or not? To be clear, its a phone he ordered on his AT&T line but he will give to me and continue to use his older phone. I use Tmobile, and am looking to unlock it. I understand the JB and unlock part and what I need to do, I just don't understand which is the best way to activate. Thanks in advance!

 

[alpineflip]

I'm trying to figure out whether I need to first activate my new iphone 4 with the At&T sim that will come with it (its a contract phone my brother is buying for me), or not? To be clear, its a phone he ordered on his AT&T line but he will give to me and continue to use his older phone. I use Tmobile, and am looking to unlock it. I understand the JB and unlock part and what I need to do, I just don't understand which is the best way to activate. Thanks in advance!

Yes you will need a AT&T sim to activate first and then you can jailbreak and unlock from there

 

[SilentLight]

Yes you will need a AT&T sim to activate first and then you can jailbreak and unlock from there

thanks for your reply. does that mean i use the att micro sim to sync it with my itunes when i receive it? or

 

[Myzhi]

thanks for your reply. does that mean i use the att micro sim to sync it with my itunes when i receive it? or

Yes.

 

[SilentLight]

thank you both for your replies! can't wait to try it out tomorrow when the phone arrives.