How to unlock a lost iPhone that has a passcode?

How to unlock a lost iPhone that has a passcode? - 1

You thief!
i don't know just push digits over & over again until it tells you to wait(a certain amount of time) to try again, then guess again until it tells you to connect to iTunes… I guess you can factory reset it & update it. It may unluck it.

You don't.

Search 'iphone DFU mode' on google. This will reset the phone so when you connect it to itunes you will have to factory reset the phone and set it up as a new device. You will however loose all data that was on the phone. I hope you're doing this legally and with your own device as doing this with any other device is a breach of Apple T&C. (I think DFU is a breach anyway!)

You remember the passcode, thats how you do it. Otherwise it just has to be wiped.

By the way if the phone is on right now, they most likely have your house marked because find my iphone is notifying them of the exact location where the phone is on the map.