A lot of Apple users are using a passcode on their iPhone, iPad, or iPod touch to protect their data. If you enter a wrong passcode “too many times” on your iPhone or iPad, your device will display, “iPhone is disabled”. Here is what you can do if your device is disabled because you have forgotten or can’t remember your passcode. You can unlock an iPhone or iPad, if you forgot your password, to regain access.
How to fix
Basically you have three options to regain access to your device.
You may use this option if you have previously synced your iPhone/iPad to iTunes. Obviously this options works if you have access to a computer. Simply connect your device to your computer, then sync your iOS device with iTunes. Then back up your device. After your backup and sync is complete, restore your device from your backup.
If You can reset the passcode by using iOS recovery mode. if you have never synced your iPhone to iTunes, then this option is for you. Please read this article regarding how to launch the recovery mode. After your device is in recovery mode, you must restore your device (this will erase everything including your passcode) then you may restore your device form your backup, either iTunes or iCloud.
This can use this option if you have Find My iPhone enabled on your iOS device. SImply visit iCloud.com (using your computer or use this tip if you are using an iOS device) then sing in. Click “Find My iPhone” and select your device (if you have more than one) and click “Erase iPhone” . This will erase everything, after that, you may restore your device from iCloud.