I just recieved a 2G (8G) iPhone with 3.1.3 OS from overseas. Informations as I see from settings -> about are as follows:
version: 3.1.3 (7E18)
Carrier: SFR 5.1
IMEI: 01 180800 0626542
modem firmware: 05.12.01
It is already jailbroken but can't make any call with it in Iran. No locked sign and WIFI and youtube are working fine. How can I fix it. When I making calls it says "call failed"?
It also shows "invalid sim" for a second when I insert sim inside but after that it indicates signal sign but no carrier. It seems I have to change the carrier but there is no "carrier" option in the settings to choose from or do auto search. What should I do now?