Truphone requires a phone that is carrier unlocked. Since they mostly use AT&T in the US, the phone needs to be compatible with AT&T frequencies/bands.
Otherwise, I know very little about feature phones anymore.
My current glovebox phone is an unlocked AT&T Prepaid Maven 3 smartphone with Truphone service. The phone is basically an 8 GB storage POS, but the battery holds a charge to 90%, powered off, when I check and recharge it monthly.
The Maven 3 was the Best Buy Black-Friday special a few years ago for $8. Between what it cost, and it being an 8 GB storage POS, I don't care much about how it survives being left in the car. I have experience from several previous phones that they last for years.
Call me weird, but I like having a fully functional smartphone with service as my glovebox phone.
As of now, Truphone does not do VoLTE (or MMS). That may change in some months to years as AT&T goes all VoLTE.
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