Twitter canceled the service back in August due to the excessive costs brought about by UK phone operators, however in an article in the Times Online, Stone says:
“service was going to be restored soon and negotiations were under way for better deals with telecoms operators in individual countries, after the hiring of a director of mobile business development last week”
“We are close with Canada and the UK is on our list as the first place to go next. We know that it will be well received there.”
As mentioned earlier today, Twitter is in the middle of a rapid surge of growth thanks to the UK’s high profile celebrities. With SMS integration available once more it is bound to help new users, the majority non-geeks, gain familiarity with the service – particularly from a portability perspective.