Do 4G phones support a 5G network?

No, 4G phones do not support a 5G network. 5G is a new technology that requires specific hardware and software to operate. While some 4G phones may be marketed as "5G-ready" or "5G-capable," this typically means that they have certain features that can support some aspects of a 5G network, such as increased data speeds or improved latency, but they are not fully compatible with a 5G network. To use a 5G network, you need a 5G-enabled device that has the necessary hardware, software, and network capabilities to access the 5G network.

4G phone will work on 5G networks, but they won't receive the enhanced 5G speed. So, if you want to experience the full potential of the next-gen network, then it is a good idea to upgrade.