1. WhatsApp Messenger
whatsapp.com
Play Store: WhatsApp Messenger (Price: Free)
2. Messenger
messenger.com
Play Store: Messenger (Price: Free)
3. WeChat
wechat.com
Play Store: WeChat (Price: Free)
4. Line
line.me
Play Store: LINE: Free Calls & Messages (Price: Free)
5. Viber
viber.com
Play Store: Viber (Price: Free)
6. Google Allo
allo.google.com
Play Store: Google Allo
7. Lite Messenger for Facebook (Android, iOS) (Free)
Play Store: Lite Messenger for Facebook
8. Telegram (Android, iOS) (Free)
telegram.org
Play Store: Telegram
9. Signal (Android, iOS) (Free)
Play Store: Signal Private Messenger
10. Tango (Free)
wtango.me
Play Store: Free Video Calls & Text