Hey there
#1 of all, thanx for making a safe app.
When I press the ‘New Chat’ button, I just see mine there! How can I start chatting with someone that I know her/his phone number and (s)he is a kontalk user?
Kontalk should find other users automatically.
The contact list will refreshed automacally from time to time.
If there are users not shown in your contact list, try to refresh this list manually.
Use the three dot menue in the contact list window.
I’m sure it will work and you can chat with your friends 
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And of course, he/she have to be in you phone adressbook.
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