Samsung Chrono 2 / Contour 2

So I have a Samsung Contour 2 for MetroPCS (Now Metro by T-Mobile). I set it to MetroPCS only and disabled airplane mode. I wanted absolutely no cellular connectivity but still wanted Bluetooth on. Surprisingly, it got coverage even though the network had shut down over 4 years ago. 1. Is this normal? 2. How do I fix this?
P.S. MetroPCS goodbye goodbye goodbye ding! See you later! Metro by T-Mobile Hello hello hello ding! Welcome to the new network.