Dell Streak Softbank Sim problam
 

I have Dell Streak Softbank From Japan If i insert the sim Phone message was 'sim is unusable in this terminal' Allready i tryed to Update 2.3.3 this version was mobile asking unlock code if I enter that code mobile waiting Requesting For long Time :( .so I decide to downgrade 2.2.2 version same Sim error message came Any one Know how to Recover this problam ?