: To stay active, these phones usually require a T-Mobile SIM card to access the unified 4G and 5G bands. 2. Compatibility Hurdles

Sprint customers, welcome to T-Mobile. While we work on bringing everyone over to T-Mobile, Sprint customers can start enjoying T-

: Very old devices (pre-2018) may struggle with modern 5G coverage or VolTE (Voice over LTE), making them effectively "bricks" for calling. 3. The Value Play