How to unlock found sprint iphone 4?

Last tuesday i was at the bus stop coming back from the library and i found and iphone 4 that was left there and immidiately turned it off because i seen it had icloud and location and services turned on. Also the phone is locked. Today i turned it on at a restaurant and noticed it still had service on. How can i erase everything from it
including the service and unlock it?

You can find the owner of this iPhone and return it to its owner. By the way, want to erase all iPhone events, you just need to restore it to factory settings. Refer to this if needed: https://www.windowspasswordsrecovery.com/articles/iphone-data/restore-iphone-5-to-factory-settings.html

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