My mate was mucking around with the find my iPhone app and locked the phone?

I got the phone yesterday and he picked it up and unlocked it and found that app (the only one i had on it) he thought it was a game as he has an old Nokia brick and never had any new tech (he lives in the middle of nowhere) anyways he locked the phone and i have tried every possible way to unlock it and i haven't done the warranty thing yet so it doesn't have a warranty and i can't take it to the nearest apple store cause i live on an island and its about 200 km away from one and we only go to the mainland 5 times a year so yeah SOMEONE Help ME Please Help ME.

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