This occurs if your internet connection drops mid-send. Wait a few moments and resend the message once reconnected.
The recipient’s number might be switched off or blocked for VoIP SMS. Try resending later or verifying that the number supports virtual SMS delivery.
Premium-rate or short-code destinations are intentionally blocked for fraud prevention. These include voting lines, donation hotlines, and carrier-paid numbers.
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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