I bought a Moto X refurbished and it will not connect to cell service. I know the SIM is fine because it works on other phones regardless of carrier. When i try to make a call, it says 'Radio off' above the contact, and it tells me to turn off airplane mode (even though it's not on). I tried the whole #*#*6436#*#* thing, and it says Radio off but won't let me turn it on. It looks like the device isn't recognizing its IMEI number either, though the phone came with one. What do i do? I've been on the phone with AT&T for 2 hours and they haven't been able to help. Thanks in advance.