This typically happens under weak Wi-Fi. Close background apps, switch to stronger data, or enable “HD Voice” in your settings.
This is a network-level message from the recipient’s carrier. Retry later or verify the number format.
Delays usually occur during carrier congestion.
Each minute of HD voice call uses about 1MB of data. Use Wi-Fi when available to avoid mobile data charges.
This can occur after an app update. Restart or reinstall the app — it will re-sync all features.
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