Using 4G sim in 5G phone

[eckbee]

I am considering buying a Samsung Galaxy S21 5G. I currently have a 4G Sim. Will I be able to use my 4G Sim in this 5G phone? 

[bristolian · Accepted solution]

There's no such thing as a 4G SIM or a 5G SIM, you have an EE SIM that's compatible with all radio technologies from 2G > 5G

It's your plan that enables 5G access on your SIM, but if either your plan or phone isn't 5G-compatible you will still access existing service from 4G, 3G or 2G.

[eckbee]

Thank you.