All.




but whatsapp (never liked it) and BBM (after 5 year of blackberry I hate anything BB related)
iMessage (rarely)
Viber (always, most used)
Wechat (sometimes)
Line (sometimes)
KakaoTalk (my favorite, sometimes)
Kik (rarely)
Threema (never, so far)
MyEnigma (very rarely)
Telegram (sometimes)
Surespot (never, so far).
Actually I am not using all of them simply because I do not have any contact using Threema, Kik and Surespot. All the others work fine with the exception of Telegram which is still a bit buggy: new contacts are not always syncronized.