Line

Line, a free-telephone app for smartphones, has won 100 million users worldwide, establishing a dominant lead over rivals hoping to emulate its success.

A short anime series featuring stamp mascot characters from the popular smartphone app "Line" premiered on Jan. 8 at 1:30 a.m. on TV Tokyo.

Almost too good to be true, the use of a smartphone application that allows free calls regardless of cellphone carriers is spreading worldwide at a dizzying clip, faster than...