OPenClaw FAQ: Fix Registration Errors & Voice Call Issues

When using OPenClaw for AI voice calls, users often encounter issues like registration lag, no sound during calls, or failed number binding. This article summarizes troubleshooting steps for the most common failures to help you quickly restore normal use.

Registration & Login Issues

If you get the error “Verification code failed to send,” first check that your phone number uses the proper international format—domestic users in China must add the +86 prefix. If you still don't receive the code after multiple attempts, try switching between Wi-Fi and mobile data, as some networks block SMS channels. When logging in and seeing “Account not found,” it may be due to an incorrect email or an unauthorized third-party login; we recommend resetting your password directly using your phone number. Note: Frequent registration attempts from the same device will trigger a temporary restriction—wait 30 minutes before trying again.

Voice Call Has No Sound or Drops Out

If the other party can’t hear you during a call, first confirm that OPenClaw has microphone permission enabled (on iOS, go to Settings > Privacy > Microphone). For the browser version, check that the website is allowed to use your microphone. If calls suddenly drop mid-conversation, it’s often due to network fluctuations—try closing other bandwidth-heavy apps. If drops continue, switch the voice engine to “Low Latency Mode” in the settings, which reduces packet loss. Also note that some carriers limit VoIP traffic; contact your carrier to confirm.

Phone Number Binding & Account Security

When binding a phone number shows “Number already in use,” it means that number is already linked to another OPenClaw account. Contact customer support with both your registered email and the phone number to request unbinding. To prevent account theft, enable two-step verification (Settings > Security > Two-Factor Authentication). If you change your phone number, unbind it from the old device first; otherwise, inserting the new SIM card may trigger a security lock that requires submitting a photo of you holding your ID for unlocking.

Payment Deductions & Subscription Management

If a purchased plan hasn’t appeared in your account, first check whether the payment was actually processed (Alipay/WeChat Pay may show a deduction while the OPenClaw balance remains unchanged). Such delays usually sync within 5 minutes. If more than an hour passes, take a screenshot of the payment receipt and contact customer support for manual top-up. To cancel a subscription, do so at least 48 hours before the renewal date; otherwise, it will auto-renew. You can turn off monthly usage reminders in Settings > Notifications to avoid unnecessary alerts. When your account balance runs out, calls will be forcibly disconnected—remember to recharge in time.