I have a new ZTE Axon 7 inbound to replace my Nexus 5. The Nexus is running Cricket, a MVNO of AT&T. Theoretically, all I have to do is remove the SIM card from the Nexus and slot it into the ZTE, and my service will seamlessly transfer over, correct? I would think that if I am reusing the old SIM, I don't have to go through the activation process again.