Question: is the iphone x 5g?
Answer: Thanks for the A2A. As of 7/10/19 no iPhone supports 5G because no iPhone built to date has the necessary hardware inside it to connect to a 5G network. They cannot be upgraded, either. If you want to connect to a 5G network you have to buy a new phone (and Apple won't have a 5G phone until the fall of 2020).