4G is fine here, in fact, the speed tests on my phone using 4G is better than the speed tests on my FTTC connection.
Which network? I have 4G from all four networks in my flat (EE, Vodafone, Three and O2) but they are dramatically different in usability.
I get these speeds typically, but they all can vary up and down dramatically. Unlike my Virgin Media connection which is pretty much 200/20 all the time.
EE = 200 Mbps download, 50 Mbps upload
Three = 40 Mbps download, 10 Mbps upload
Vodafone = 30 Mbps download, 5 Mbps upload
O2 = 3 Mbps download, 1 Mbps upload.
So always try all the networks using PAYG SIMs in exactly the location you need service. (Virtual networks don't count at this point, but may provide cheaper price plans).
There are two places in town where Three have deployed "poles of wonder" providing 5G coverage, one is outside Morrisons (??) and the other on a dual carriageway. Neither covering very many domestic homes.
22 years of broadband connectivity since 1999 trial - Live BQM