Visible

I haven't checked the Pixel 5 model but my 4a 5G model is not the MMW version that I purchased from Visible. So I'm assuming when they are doing everything on the software/network side. I'm even using the 4G sim card that came out of my iphone in my ...

I have it on my 4a 5G now after just updating. 

When a phone receives 5G support will it need a 5G sim to support it like with 4G or is everything done on the back end?