For reference the 3/EE mast local to me has been built almost 12 months now and still not live.
Fibre and 5g antennas were installed mid summer time but it’s still sat dormant.
There’s another one about a 2 miles from me that went up sept/Oct 2020 and also isn’t live.
I was told by a three rep that they wait for a cluster of masts to get built before they go live - there’s a much younger unfinished one about the same distance away as the older one so I guess the wait is for that one to get completed before the go ahead but honestly no one knows and 3/EE aren’t telling