NOT ON THE LIST IN 2018

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
2017: –    2016: –    2015: –    2014: 94    2013: –   2012: –   2011: –   2010: –   2009: –   2008: –   2007: –