It added that this is equal to around 60% of the world's population.
The report said India and China accounted for approximately 35% of the estimated 180 million net additions during last quarter of 2011.
The mobile services remained dominated by GSM services with 75% market share. CDMA and HSPA (3G) accounted for 15% market share, it added.
Ericsson study found that mobile subscriptions have grown around 13% year-on-year and 3% quarter-on-quarter.
Globally, mobile broadband subscriptions have grown around 60% year-on-year and have reached close to 1 billion mark, it said.
According to the study, there is a strong momentum for smartphone uptake in all regions with approximately 30% of all handsets sold in 2011 were smartphones, compared to around 20% for the full year 2010.
"However, only around 10% of the worldwide installed base of subscriptions use smartphones. This means that there is considerable room for further uptake," the report said.