I am new to T-Moble we join the 55+ plan, prior to switching to T-Moble I had just bought 2 new unlock S8 phone from Best Buy. One was being use on Verizon’s network and the other on ATT’s network. They are now both being use on T-Moble’s network.
To find your IMEIFrom a Home screen, touch and swipe up or down to display all apps.
From a Home screen, navigate: Settings > About phone.
View the IMEI.
I have found that even if you do a network check with your IMEI and it does not show compatible, it does not mean your phone will not work on the network you are looking to use. The only way to know for sure is to put a SIM card from that network in your phone.