i am using iphone 3gs , BB 06.15.00, shsh ios 4.0,4.0.1,4.0.2,4.1,4.2.1r1,5.0.1, new bootrom, ios 4.1 jailbreaked and unlock with ultrasnow. can i upgrade my ios to ios 5.0.1. is it have any problem for working and network. i am from india, i have no original sim. please help me.