(Telecompaper) Mobile data traffic worldwide increased 15 percent on a quarterly basis and 55 percent year-on-year in the second quarter, according to the latest report from Ericsson. The company found that there are now over 3 billion mobile broadband users in the world, an increase of 140 million the three months to June. The growth in mobile data was supported by both more 3G and LTE users and more smartphones. The number of LTE users rose by 115 million to around 740 million, while the number of GSM-only mobile users fell by 80 million in Q2. Smartphones meanwhile accounted for 75 percent of all phones sold, up from 65 percent in Q2 2014. In total, Ericsson estimates there were 7.2 billion mobile subscriptions in the world at the end of June, equal to 99 percent mobile penetration. The total increased by 5 percent year-on-year and by 0.7 percent compared to the first quarter. The strongest growth in the period was in India (+12 million users), Myanmar (+5 million), Nigeria (+4 million), the US (+4 million) and Bangladesh (+3 million). The actual number of mobile subscribers worldwide was a smaller 4.9 billion, due to some users having more than one Sim.