NOT ON THE LIST IN 2019

LINE is a communications app that allows you to make free voice calls and send free messages whenever and wherever you are, 24 hours a day!

Website: line.me
Cost: Free and premium versions
Availability: Download

Past Overall Rankings
2018: –    2017: –    2016: –    2015: –    2014: 94    2013: –
2012: –   2011: –     2010: –   2009: –     2008: –      2007: –