He developed a Cydia repository called SAM that can officially activate iPhone 3G and 3G S on iOS 4.2.1 without the original SIM card or hactivation. Many people who unlocked their iPhone 3G and 3G S with the recent Redsn0w 0.9.6 b5 and Ultrasnow 1.2 were reported to have these problems. Unlocked models have less battery life and produce more heat than the officially activated models. So they usually not support push notifications. The application requesting APNS token will be jammed in unlocked iPhone models. The Apple iOS is designed in such a way that all applications with the push facility should request the Apple APNS servers for a token that identifies the device.
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