Only use the most secure messenger!
Check:
https://securemessagingapps.com
and rate the security
🟩=3 🟨=1 🟥=0
Results:
1. Threema = 82 = most secure
2. Session = 79
3. Signal / SignalApp = 77
4. Amazon Wickr = 62
5. Element / Matrix = 59
6. WhatsApp = 34
7. Telegram = 29
8. Apple iMessage = 25
9. Facebook Messenger = 25