sim card

Thanks everyone for your interest and help.  The FCC ID is RAD287. T- mobile lists the specs for this phone on their website. For Network it says 2G/3G/4G/LTE  capable and a bunch of frequencies.  But it also says VoLTE not capable. If it is the case, as Fireguy says, that VoLTE will be necessary after 3G shutoff that would seem to settle the question. Perhaps I should rephrase the question to:  What do I have to do to survive 3G shutoff?  T-Mobile has sent me a message saying I have to upgrade or buy a new phone. What do they mean by upgrade? I am starting to think  upgrade means buy a new phone. I should say they did not send the message to the One Touch phone we are discussing- they sent it to an older 3G phone I am using.