Oh bummer! No service is no good nightraven.
Have you ever been able to get service on this phone before? If you remove the SIM and put it back in, does it connect to T-Mobile? You may also want to try searching for networks to see if it gives you signal.
Please keep us posted on this so we can help.
There are different models of Moto G. Which one do you have? Do you know how to do a manual network search? Have you tried to search for networks?
Manage your T-Mobile account