Kontalk
ផ្កាយ 3.0 ក្នុងចំណោមផ្កាយ 5 (ផ្អែកលើការពិនិត្យ 1)
The Kontalk Network is a community-driven instant messaging network designed for smartphones and tablets.
You have to provide your phone number in order to use kontalk. Apart from that, kontalk seems to be quite trade-free, because there are no ads or trackers. Everything is end-to-end encrypted by default.