The biggest difference between 4G and 5G is the speed. 5G has the potential to be up to 10 times faster, because the way 5G works means that it uses smaller wavelengths and much higher frequencies which can support far more simultaneous connections than 4G.
What is a 4G LTE SIM card?
A Subscriber Identity Module (SIM) card is a small memory card that’s inserted into a 4G LTE or 5G device. The SIM card lets you access our 4G LTE and 5G networks. This SIM card has very limited storage, typically 128K to 256K, and cannot be used to store photos or documents.
Do 4G SIM cards work in 5G phones?
A SIM card that was activated in a 4G device will still work with a 5G device, but you may have trouble connecting to the 5G network. Check with your carrier if you’re not seeing the little 5G logo pop up on your screen and you think you should be.