Many people are experiencing various issues after unlocking their iPhone with BlackRa1n and BlackSn0w. Here are some of the problems you may have encountered: No 3G or Edge Can’t connect to wifi Problems with YouTube No push notifications There are 2 possible solutions for this. The first fix is to reset your network settings. On your iPhone, go to Settings > General > Reset > Reset Network Settings. After resetting your settings, make sure to reboot your iPhone. It is very important to reboot or else, the changes won’t take effect. A few people told me on Twitter ... - Sebastien Page