If you want to call somebody who has a set price per minute, you have to deposit funds for calls. With no funds, you are only able to call those who have set the call rate for zero EXY per minute.
To check if you have funds:
1. Look at the top left corner of the app - your funds are always visible there for you.
To find out how to get funds for calls, read this solution: How do I get my funds for calls?
If you didn't find answer to your question in our FAQ, feel free to ask.
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Have a great day!