Activating iPhone 4 with someone else's SIM

[jaylay0707]

I just got a used iPhone 4 that needs to be activated. I plan on unlocking it, and I would hacktivate it but I don't know what OS it is running (crossing fingers for 4.1). My roommate has an iPhone 4 as well, can I use his SIM to activate it? Im just scared of extending his contract!

Thanks!

 

[Applejuiced]

Yes, you can. It will not change anything to his contract or account.

 

[jaylay0707]

Thank you!!

 

[Applejuiced]

Welcome and good luck.
But even if its on 4.1 you wont be able to unlock it.
You need 4.0.2 or lower on it to unlock.

 

[jaylay0707]

Thanks. Yeah I checked the baseband, it's 02.10.40 so it looks like I'll be waiting a bit. Oh well, it was free