Got a spare Iphone that I want to give it to my dad. With the current AT&T phone plan, my dad (actually me) would have had to pay $20 a month for the data plan otherwise the phone won't be activated with my dad's SIM card. It left me no choice but jailbreak it. The procedure to jailbreak and unlock the phone is relatively simple. The only problem I encountered was getting the message "Different SIM Card Detected" and it won't let you logon to the phone. The problem was resolved by pulling the SIM Card out and did a manufacturer restore. Losing data wasn't a big deal to me in this case. The following is a step by step jailbreak for my own record (Do this only if after jailbreak and unlocked the phone but still got the SIM card message and you are willing to lose the data):
1. Restore the phone to manufacturer's firmware. (Update to 3.1.2 firmware first)
1.1 Connect the phone to Itunes (someone recommended using the cheap Iphone USB cable or a USB hub to disable some enhanced Iphone features that works with MacBook)
1.2 Turn off the Iphone
1.3 Press and hold On/Off button and the Start button until the Apple logo comes up
1.4 Press and hold the Start button until Itunes goes into the Recovery mode and prompt you to restore to the manufacturer's settings.
1.5 Follow the ITune's instructions
2. Install BlackRa1n. Just search on Google for a copy and follow the instruction by the software. Make sure you choose Cydia package in the installation.
3. If you have 2G then use BootNeuter to unlock the phone. For 3G/3Gs, use RedSn0w.
4. Insert your SIM.
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