It's been a bit over two years since T-Mobile merged with Sprint. T-Mobile discontinued the Sprint brand four months later, in August 2020, but many legacy Sprint subscribers have still yet to swap ...

As impressive as it is that some customers are still using a Sprint SIM card in 2023, its days are numbered. According to a document shared by The T-Mo Report, T-Mobile started sending legal notices ...

T-Mobile appears all set to eliminate any remaining traces of Sprint in a few months. A leaked company document reveals that the carrier will stop supporting legacy Sprint SIM cards on May 1, 2023.

T-Mobile is reportedly considering acquiring Sprint in a deal that would create the third largest wireless carrier in the U.S. But there are enough wild-cards to cast doubt on an outright merger.

Does Sprint even offer GSM service? If not, I don't see how your Razr would work. The Sanyo is a CDMA phone. IIRC, only Cingular and T-Mobile offer GSM service in the US.