You will find that Google and the cell phone service companies are playing with the older phones to push the users to new phones. Look at the iPhone se 2020. Brand new phone and it will not support the new cell service 5G . Want to bet Apple is playing a game to force users to new upgrades every year?
You may have not realized the changes in the web displays on a computer screen because of the size but push the same detail to a cell phone and you get what your seeing, a crunched mess.
As for the older models, none of them support 5G, but the iPhone 11 Pro and iPhone 11 Pro Max which is a new phone also does not support 5g.
I have not checked other cell makers to see what they support but it looks like it may be something I need to do.
I think I need to see if I can get my 1975 Bag phone to work