how to reactivate recovered iphone 4s after deleting account from icloud

I had all the information erased from my phone on icloud hoping that once i connected to itunes it would reactivate by itself but that has not been the case. In desperation i erased the iphone from my icloud account and that was of no avail either. Itunes keeps asking me to introduce the sim card pin but the iphone does not give that option