If you're looking to connect to the 5G network you'll need a 5G compatible phone. Older phones don't have the technology required to produce 5G speeds.
Will 5G work on 4G phones?
5G cell phones will still use 4G technology, but to access the 5G network you will need a 5G compatible phone.
What phones have 5G?
There's a wide selection of 5G phones available including the Samsung Galaxy S21, Apple iPhone 12, Motorola One 5G, Samsung Galaxy S20 FE 5G, and OnePlus 9 Pro.