Phone troubleshooting

SMS not delivering

• US: A2P 10DLC not registered — most common cause.
• Content flagged by carrier — URLs in first message, all caps, or spammy keywords.
• Recipient in DND list.
• Unverified toll-free number — verify to lift throttles.

Call drops or echo

• Check internet — VoIP needs ~100 kbps stable.
• Browser microphone permission denied.
• Headset mic and speaker picking each other up — use a headset with echo cancellation.