Samsung galaxy xcover 5 (work supplied).@Martin.S what phone are you using, band 40 is meant to be good for carrier aggregation:
Overview The 3GPP B40 (2300 MHz) TDD LTE band is the eighth most popular band used by public mobile operators for LTE network deployments, and is typically deployed due to the wide availability of spectrum and its short range permits deployment dense coverage for maximum capacity. Many...halberdbastion.com
I just don't understand how O2 are screwing it up, either they have too many customers or there's issues with their implementation.
It only held on to B40 for around 5 minutes before dropping to H+ and then B20.
I wasn't playing around fixing bands it just naturally locked on to it. No data flow at all, admittedly the signal strength was weak.
It is VERY rare that I see any CA on O2 down here in Devon.
For comparison on my own phone (Samsung A70) I had 2CA and even 3CA on the Virgin mobile network (Vodafone) yesterday.