why does new phone say invalid SIM?

one1

Member
Bronze
Sep 20, 2007
53
0
6
Signal Mountain, TN
#1
my buddy bought a new iPhone and he wasn't getting good service so he sold it to me a week later. It is a brand new 1.1.3 phone that I restored to 1.1.1 and jailbroke using the keypad trick and jailbreakme.com

For whatever reason when i restored it today to hook it to att service
via iTunes, both the phone and the iTunes say invalid sim. I tried three brand new sims and all do this.
it has never been unlocked and the numbers all match on the phone.

Any help please?
 

themanofthedark

New Member
Gold
Jan 5, 2008
2,674
0
0
25
Boston
#3
if you restore to 1.1.1 it will show the incorrect sim.

you must restore to 1.1.3.


also, you cannot easily downgrade the baseband on a BL4.6 phone.