This error occurs when the recipient’s network is temporarily unavailable. Retry later or confirm that the destination number is correct.
Simply choose “Add Number” again and follow the same steps. You can manage several numbers under one dashboard.
Check if sound permissions are allowed and your device isn’t on silent. You can also change ringtone type in settings.
Double-check the dialing format — always start with “+” followed by the country code (e.g., +44 20…).
Battery optimization or data saver mode can interrupt ongoing VoIP calls. Add CallMama to your phone’s “Unrestricted Apps” list.
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