High network latency can cause echo or delay. Try reconnecting to a faster network or closing background downloads.
Check that you have calling credits and microphone permissions are enabled. If issues continue, test with another number or restart the app.
That number was likely purchased by another user moments earlier. Refresh the list to load available options and select a new one.
Some services block codes to VoIP numbers. Confirm your number supports SMS or try receiving via a different channel.
Each minute of HD voice call uses about 1MB of data. Use Wi-Fi when available to avoid mobile data charges.
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