How to reset the iPhone 4 passcode

1.disconnect the usb cale from iphone4 and leave the other end connected to your pc

2. launch itunes

3. press and hold the home and power button on the top of the phone to turn off the device

4 while holding connect the cable to phone

5. phone will be detected in recovery mode

you must restart the device

• from itune summery look for restore
• click restore button

This will wipe all files, settings, and apps from the iPhone, including the passcode. When the restore is finished, the iPhone will be at the factory settings. At this point you can choose to start from scratch