"Spending (in constant USD) on mobile services will grow 4 per cent to reach USD 21.4 billion in 2015," Gartner said in a statement.
Spending on mobile services will be driven by data services which is expected to grow 15 per cent to reach USD 6.5 million in 2015, it added.
"A large chunk of this growth will be driven by the increasing use of cellular services on data-centric devices, such as tablets and notebooks, through either embedded cellular modems or USB sticks," Gartner said.
In India, the rise in spending on data-only connections will be driven by two user scenarios - first, to complement their fixed broadband connectivity, so they can use their larger-screen data-centric devices on the go, said Neha Gupta, senior research analyst at Gartner.
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Gartner said newer and faster networks, rise in number of users of these networks, and more affordable smartphones will help to increase spending on data services.