Nokia 6235i Reset

Ok so I bought a Nokia 6235i on ebay and it looked alright. But when I turned it on it still had all the previous owners stuff on it. I went to go reset the phone to factory settings but I just get something saying enter the lock code. I tried 12345 and the last 4 numbers of the previous owners cell number. I have Metro PCS and have not activated the phone onto my account yet, could this be why? If anyone can help me out I'd appreciate it!

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The owners changed the lock code obviously, but there is no way to get around that other than getting the right code from the owners or having the phone re-flashed to factory.