I see a Guardian article going into laborious detail on just what this wacky device is
Reportedly Donald Trump had a burner phone, used presumably, inferentially, or allegedly to organize the events of January 6. Surely, though, as events and details are disentangled to … No one’s satisfaction… We can refrain from presumptions of scafflowing (back in the day, keepers were assumed the province of drug dealers and pimps, right?) — and we can still maintain a place for burner phones and throw up that slogan — “When Burner phones are outlawed, only outlaws will have burner phones”.