3gs 6.1.3 activation help plz

have a 3gs unlocked that i restore from 4.1 to 6.1.3

if i try to activate itunes say no sim in iphone

after i restore to 4.1 same problem

via Welcome to gsm-tips http://forum.gsmhosting.com/vbb/f631/3gs-6-1-3-activation-help-plz-1734138/