Ericsson said the total number of mobile subscriptions in the quarter reached about 7.2 billion globally, including 108 million new subscriptions.
"India grew the most in terms of net additions (+26 million), followed by China (+8 million), Myanmar (+5 million), Indonesia (+4 million) and Japan (+4 million)," Ericsson said in its mobility report.
The Swedish firm said global mobile penetration reached 99 per cent in Q1 2015.
"Smartphones accounted for close to 75 per cent of all mobile phones sold in Q1 2015, compared to around 65 per cent during Q1 2014," it added.
"With the continued rise of smartphones comes an accelerated growth in data usage: smartphone data is predicted to increase ten-fold by 2020, when 80 per cent of all mobile data traffic will come from smartphones," it said.
Long-Term Evolution (LTE) technology based phones continue to grow strongly and have around 600 million subscriptions, with approximately 105 million additions in Q1 2015, it said.
"This immense growth in advanced mobile technology and data usage, driven by a surge in mobile connectivity and smartphone uptake, will make today's big data revolution feel like the arrival of a floppy disk," Ericsson Senior Vice President, Chief Strategy Officer, Rima Qureshi said.
The report said an expanding range of applications and business models coupled with falling modem costs are key factors driving the growth of connected devices.
Ericsson's forecast points to 26 billion connected devices by 2020.
"Each year until 2020, mobile video traffic will grow by a staggering 55 per cent per year and will constitute around 60 per cent of all mobile data traffic by the end of that period," it added.
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