If you don't have any funds for calls you are only able to call recipients who won't charge you. That means the user who is receiving your call has their call rate set for zero EXY per minute. This is the only way to make a call without funds.
Remember that to call users who have set their call rate, it is necessary to deposit funds before making a call.
To find out how to get funds for calls, read this solution: How do I get funds for calls?
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