Vodafone, too, will sell iPhone in U.K.
Announcement comes a day after Orange says it will start selling Apple's handset, marking the end of O2's two-year exclusivity.
Vodafone will begin selling the iPhone in the U.K. early next year, the operator said Tuesday.
The news follows Orange's announcement Monday that it will start selling the iPhone. Unlike Vodafone, however, Orange will begin stocking the iPhone before year's end.
The announcements mark the end of O2's two-year exclusivity on Apple's popular handset.
Vodafone Group already sells the iPhone through 13 of its operators around the world, while Orange stocks the handset in 28 countries and territories. Neither Vodafone nor Orange has announced details of their iPhone pricing plans for the U.K. market.
Among the other U.K. operators, T-Mobile has said it has no plans to offer the iPhone, and 3 has not indicated its intentions regarding the handset.
David Meyer of ZDNet UK reported from London.