A:Answer I do know that these phones can be "re-purposed",
There is a SIM chip inside the phone, but I am not sure it will work 100% with T-Mobile.
The whole point of this phone is to utilize the Lively (formally Great Call) assisted services - pressing the "Star" button for almost instant assistance, including medical assistance or in rare cases "Where am I?" if the person were to get lost. I don't think T-Mobile does that kind of thing!