I have an iphone 4s which i lost recently, retrieved, and restored from icloud. Now it wont work - its searching for the network. I have tried ##8...# for activation and update but it does not work after full reset and several turn off sequences. I have called sprint a number of times for help and they ask me for an IMEI number which i don't have since my iphone does not use a SIM card. I'm at a loss at what to do next. Last resort is a Sprint store. Any thoughts?