Ofcom's annual comms research shows something similar in terms of both fixed and mobile broadband increasing. 76% of users in a recent survey are not surprisingly unimpressed with the speeds they can achieve.
El Dunstone states:
"We get a sense that the mobile broadband thing has peaked. We are seeing some of those people begin to realise that the bandwidth you get on mobile is so much less than you get on a fixed line. Mobile broadband is increasingly a supplementary rather than a substitutional thing, and an increasing proportion of Carphone sales are of pre-pay dongles."