Reliance Jio has become the second telecom player in terms of users, capturing more than 23 percent of the Indian market, according to mobile communication app Truecaller’s TrueInsights Q4 Report.

Jio has grown aggressively in the latter half of 2016, racking up over 16.2 million subscribers in November and taking its total subscriber base to 51.87 million within three months of launching the service.

The growth is owing to the Jio welcome offer of providing unlimited data to its subscribers till March 31 this year.

As per the latest data from TRAI, India’s telecom subscriber base grew to over 1.12 billion at end-November 2016 and the large number of additions was credited to Reliance Jio Infocomm.

The report also found that Jio users make calls of less than 30 seconds while Vodafone users make the longest calls — around 41 seconds.

Subscribers in Jammu and Kashmir make shortest calls of 28.63 seconds while Kolkata users have the longest median call duration of 42.17 seconds.

According to TRAI data, Jio was leading in mobile broadband segment followed by Idea Cellular with net addition of 2.52 million new customers in the month of November 2016. Bharti Airtel and Vodafone added 1.08 million and 890,794 subscribers, respectively.

Mobile internet usage is expected to grow to over 500 million customers by the end of 2017 with a large portion of those picking Jio.

Reliance Jio has become the primary data connection on most of the mobile devices in India, with 42 percent users having activated Jio in their 4G-enabled slot, followed by Airtel at 17.54 percent, Vodafone at 12.26 percent and Idea at 11.5 percent.

Jio is leading in data consumption, with a Jio-user logging 6.54GB on average compared to 1.28GB on Airtel, 1.29GB on Vodafone and 1.32GB on Idea Cellular.