LINE is a Japanese proprietary application for instant messaging on smartphones and PCs. Line users exchange text messages, graphics, video and audio media, make free VoIP calls, and hold free audio or video conferences.
- It's not an VOIP/SMS/MMS service, it's a proprietary chat service that could be compared to Google Hangouts (but not Google Voice).
- Google Voice offers free landline calls, LINE does not.
- Does not offer the ability to call a phone number.