Isn't Tello CDMA ? Why do I need sim card? Thinking about how it all works, Tello is supposed to be CDMA, and it requires the IMEI number. But when I take out the sim card, my phone says 'Emergency Call only". Isn't Tello CDMA?  

If I reuse the IMEI on another CDMA network (let's say Verizon), would the phone still work on both networks as long as I swap SIM cards?