iPhone 4 locked by it's previous owner iCloud account I've bought a iPhone 4 of an auction site. When this iPhone got delivered and I turned it on, it asked me for the PIN code of the previous owner and noticed that the iPhone 's language was completly in French.

When trying the most common PIN codes (0000, 1234, 4321, etc...), and all attempts failed (from all the tries, I had to wait an hour to try again....), I decided restoring it in iTunes.

After restoring it in iTunes to the latest supported IOS; 7.1.2, and putting an SIM card into the phone, I had to configure the language and such. After that screen, it asked me to login on the previous owner's iCloud account.

The problem is, I dont know the previous owner of the iPhone.

Can I remove the previous owner's iCloud settings from the phone?
No.

You need to contact the person who sold you the phone and get them to either give you the iCloud details, or give you your money back.

The phone can not be activated by Apple until it has been unlocked using the iCloud details (login and password) that it was locked with. This is a security measure to stop stolen phones from being useful to people.

If the seller does not have the iCloud details, then it was probably not their phone to sell, and they should return your money.

Sorry.