u can restore u'r iphone to 4.1 which is signed version from apple and jailbreak with redsn0w 0.9.9b7 when all is done ( download Jailbroken tool 1.8.1 ) and u can install offline ( without wifi ) ultrasn0w 1.2.4 for unlock u'r iphone , instalous and appsync 4.0+ after u finished with this program restart u'r iphone and congratulation u'r iphone is unlocked and have cydia
without wifi