Just been reading up on this.
4G is a generation and covers a number of frequency bands.
The idea is to be able to provide up to 100Mb/s second.
This top speed is very dependent upon location, climate and of course transimission equipment, and not all phone have an equally good receiver.
So LTE (Long Term Evolution) was coined to acknowledge the incremental approaches that were above 3G specs but have not reached 4G.
The increments are different protocols on how a network tries to increase the speed. Different networks can use various methods and are very likely to pass on an LTE message when they do to show they are taking it seriously.
So LTE on one network isn’t necessariyl the same as an other although the different protocols etc are no doubt aquired by most networks.
How the phone interprets the ‘4G’ transmission is another issue and clearly different phones will show different symbols.
It may well be that iPhones and Android use different receivers and show differnet iocns.
And unless all Androids use equivalent receivers and software they also may have various cases which show LTE or 4G
The main issue is that LTE is an attempt at getting 4G speeds and 4G doesn’t mean it has been successful
I am using a SIM-card provided by UPC Switzerland for my FP 2, but now using with the new FP 4, without any special settings. Sometimes I have 4G, sometimes 5G, but I don’t know on what this depends, I presume it might just be my location.
I got the SIM-card at UPC in Zürich (shop at Kirchgasse). I find it astonishing, that UPC would provide 4G/5G, but not Sunrise. Perhaps you try at a UPC-shop?
Kind regards, Alois
My guess is that they don’t want to officially confirm any support for it because they don’t want to bother.
But 4G as a standard should work on all compliant devices. VoLTE is a different matter and different operators seem to handle that differently.