please help i-phone in japan

[vi-sh]

hey guys please help i have a i-phone registerd through softbank here in japan and after updating the software we tried to jailbreak it (in bankok) but failed. now i'm back here in japan and tried to put the original sim card but not i'm not getting any network service no matter what. please HELP!!

 

[jamesus]

Are you using an authorized SIM?

You might try to restore the iPhone via iTunes.