8/F CHINA HONG KONG TWR, 8-12 HENNESSY RD, Wan Chai, Hong Kong

I hear a message like ‘Number not available’.

This is a network-level message from the recipient’s carrier. Retry later or verify the number format.

Related QNAs

Battery optimization or data saver mode can interrupt ongoing VoIP calls. Add CallMama to your phone’s “Unrestricted Apps” list.

Yes, your number must remain active to receive new messages. Renew your plan before expiry to avoid missed messages.

You’re only billed for successfully connected calls. Pre-authorization amounts may appear briefly but will be released automatically.

Please ensure your plan includes inbound SMS. Go to Settings → Features and verify that SMS reception is enabled for your number.

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