will a unlocked sonim xp3 phone work for t-mobile after january 1 2022

I purchased one if those recently and have it currently running in t-mobile. When I checked it's model and EIN number with tech support I was assured it will work after Jan 2021. I hope that will prove true. BTW…I like the phone…though it is bulkier than my DuraXT which t-mobile says will not work after the new year.