My GF left BT for VM because when she needed it most at peak times it was useless. As was their customer service (no returned calls whatsoever) - oh and Google is down at the moment while I was sat next to her using google on my VM mobile.
I diagnosed their problem several times as being their DNS server. I could ping the IP addresses of the likes of the BBC, but not the
www.bbc.co.uk
A difficult one to explain to "David" in Goa.