If you repeatedly enter the wrong passcode, your iPhone will be disabled for longer intervals before you can try again. After too many unsuccessful attempts, you won't be able to try again until you connect it to the computer with which you last synced it [if it has been synced to a computer].
Note: You can configure your device to erase itself after ten consecutive incorrect password attempts. This setting is off by default. It can be turned on by tapping Settings > General > Passcode Lock.
If you cannot remember the passcode, you will need to restore your device using the computer with which you last synced it [or iCloud]. This allows you to reset your passcode and resync the data from the device (or restore from a backup). If you restore on a different computer that was never synced with the device, you will be able to unlock the device for use and remove the passcode, but your data will not be present. Please also note that Apple representatives can't unlock an iPhone for you without restoring the iPhone, either. The restore process will erase everything on it. Apple's official instructions to restore an iPhone with iTunes are:
Note: This process will wipe all data from your iPhone 4. You may be able to sync most of the data back once you have restored it.
1. With the iPhone 4 disconnected from your computer, power it off. Press and hold the Power button on the top of the device for a few seconds, then slide the red slider. If this method doesn't work, press and hold the Power and Home buttons for a few seconds until it goes off.
2. With the iPhone 4 off, press and hold the Home button while connecting it to the computer you registered it from. It should then power on.
3. Keep holding the Home button until you see a Connected to iTunes message appear on the screen.
4. Open iTunes and it should provide a message about an iPhone connected in Recovery Mode.
5. In iTunes, select the Summary tab and click Restore and follow the prompts.
6. You may attempt to sync your iPhone back to your iTunes to restore any data lost in the recovery process.
I hope this helps! Thank you for using FixYa!
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