This is step by step guide on how to jailbreak your iPhone (including iPhone 4) running on iOS4 with JailbreakMe by Comex but before starting make sure that your iPhone is activated on iOS 4.0.0 or 4.0.1 with original SIM card. iPhone 4 users still need to be wait a little more for ultrasn0w update.
Step 1: Open Safari in your device.
Step 2: Write http://jailbreakme.com and hit Go button.
Step 3: To start the jailbreak simply slide to jailbreak.
Step 4: Downloading will be start and it might take some time depends on your internet connection.
Step 5: After downloading is completed, jailbreak process will start.
Step 6: Once the jailbreak process will be done, you will be notified, hit Ok button and Cydia will be added to your Springboard.
Step 7: Go to your Springboard and you will find Cydia there.
Congrats, you have jailbroke your iPhone, now you need ultrasn0w to unlock your iPhone.
Note: ultrasn0w for iPhone 4 is updating shortly. Please keep visiting us and we will let you know whenever it will be available.
Update: After you have jailbroken your iPhone 4, you can now unlock your iPhone 4 on iOS 4.1/4.0.1 with ultrasn0w 1.0-1, step by step guid is posted here.
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