The biggest potential problem is that I cut a micro SIM card down to a nano SIM to fit in the Moto X. I use my phone on Straight Talk and they don't have a nano SIM yet. But I don't think the cut SIM card is the issue. The phone came with some T-Mobile SIM card. Even though it doesn't have any service from T-Mobile associated with it, when I put the T-Mobile SIM in, it will show that there is service and wi-fi will work. However, after the phone shuts off and I put the T-Mobile SIM in, it still says no service. Plus, the my cut Straight Talk SIM works perfectly fine until the phone shuts off.
Even though it would make sense that cutting my SIM card would cause this problem, I really don't think that's the case. It seems like it's more of a software issue at this point. Does anyone else have this problem or have any insight?