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If your client has run out of funds, ZeroBalance will allow him to request a callback from any another user by simply making an outbound call.

Even with 0 balance user A’ can dial user B’, who will receive an inbound call and will be able to call back. User A’ should be in the country with free incoming calls, otherwise he should have some balance for at least 1 minute of incoming call.

Please also note that ZeroBalance is not available in countries with extra rates.