According to the ONS, some 45 per cent of people surveyed said they made use of the net while out and about, compared with 31 per cent in 2010.
Some 71 per cent of internet-connected 16 to 24-year-olds used mobiles, the ONS said.
Martha Lane-Fox, who was appointed as the government's UK Digital Champion, commented: "That so many offline households don't see any reason to get online reinforces the importance of the digital champions network that the Raceonline2012 partners are creating."
Earlier this week, research revealed that just one in 20 of the over-65s owns a smartphone.
In contrast, the regulator Ofcom confirmed that 17 per cent of those aged between 55 and 64 own a smartphone.
Posted by Simon Jones
