Follow the instructions on this link and you will be fine.
http://www.wikihow.com/Reset-a-Forgotten-Password-for-an-iOS-Device
This is why it is important to regulary back up your device.
SOURCE: iphone disabled
To unlock Iphone4, there are jail-breaking and unlocking by codes/remote unlocking. As far as i know, jail-breaking iphone's were not unlocked fully. If you update a new software they again get locked and you need to unlock the phone again. There are site which remote unlock iphone's successfully. i will suggest the website TheUnlockArena.com which is doing good service .....you can approach this website.
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