jailbreak is pretty much the only option.
google a guide for your software version and use that.
Good luck.
Is there any negative effects from Jailbreaking then unlocking the phone?
Its locked to AT&T and the model number is A1429
I'm sure AT&T model is A1428 which won't work in Australia, A1429 model is for Verizon or Sprint. Verizon iPhone 5 comes unlocked out of the box, if it is Sprint or another carrier owner will need to call the carrier to get it unlocked.
So there is nothing I can do?
I think you can go to one of these stores that sell unlocked phones and ask for some help.
My friend already tried that and they said he had to buy an imei code or something like that to unlock it
You can get the imei from your phone, http://support.apple.com/kb/ht4061
Then what? They won't unlock it at the shops though
Oh wait shit! Its Sprint xD
Just have your friend call and say he going on vacation to another country, they will unlock for international carriers![]()
Is there anything else I can do?

