This seems a very unfortunate matter, although I suppose some may be able to avoid more increases by changing their phone provider.
http://www.bbc.co.uk/news/business-14677298
It would be of some comfort if we could observe that BT is trying to economise by some rationalisation of their workforce and administrative procedures.
I left BT last year due to the constant price rises but I read in that article that prices will be frozen until 2013 and about time too.
I know that 5% isn't that much but when you factor the 9% increase earlier this year, and the 10% last year it is a bit of an insult in these austerity times.
p.s. the 10% hike last year was the reason why I left BT and moved to O2.
O2 put their telephone packages up too but just the once although I expect other telco companies to follow BT's lead - a bit like the UK energy market - one company rises prices and then they all do it