How do I reset the iPhone 4?

[iMore Question]

how to reset iphone 4

I phone 4 was recently stolen but I got it back and they changed the pin to unlock it. So I tryed holding the power and home button to reset it and it did but then It said to put in icloud user and pass and they changed it how do I get in my device

 

[nikkisharif]

Re: how to reset iphone 4

Did you report it stolen & how did they know your pin?