The IMEI is just used to identify the phone on the network. It is not an identifier of the subscriber (you). Its used to ensure that only valid devices, not stolen, can access the network. The SIM Card is what is used to identify the subscriber to the network. So in short there is not much he/she can do but I would still recommend calling your wireless network.Ok I think I got duped. I got overly excited after reading on here that they were going to release a software unlock and I landed up giving them my IMEI. How screwed am I?