I've noticed my MVNO Vodafone service, which was faultless, suddenly declining. Random dropouts are fairly common, no connection inside some big buildings (whereas Vodafone's infrastructure is known for being better inside and Three's much worse. Makes me think I'm being shunted onto Three's infrastructure)
I have a horrible feeling that 3 traffic is being prioritised over Vodafone MVNO traffic, leading to service deg.
End of the day, I was on Vodafone's network for a reason - it was the least congested in my area. 3 was crap. If I’m suddenly fighting for bandwidth with 3 customers because of this merger I will have to try EE (o2 is known garbage around here; 2 mbps at most thanks to traffic management).
Ofcom should never have allowed it - the UK does not need reduced competition in this space.