I recently bought a lg optimus l9 for $30 from a friend. Its in excellent condition. I asked him where he got from but he gave no certain answer. So I checked the imei on tmobiles website it it's clean. If I try to activate it and it's on someone's account what will happen. Can I just insert a SIM card and activate by calling 411 or* 228. Is there a way to see if the imei is already hooked to someone's account?