The growth of 5G networks doesn’t mean 4G is going away. Mobile carriers will use existing 4G LTE networks to provide their customers’ cell service well into the next decade. 5G networks will work with 4G — not outright replace it . The upshot is that 5G-capable cell phones will still use 4G technology.
Read moreWill older phones work with 5G?
Most phones 7 years old or older, which includes the iPhone 5 and iPhone 5S. There is a list here of all phones that will continue working on the AT&T 4G network. Some phones, such as the iPhone 12 and up will also work on the 5G networks .
Read more