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LC Phone System - Error Code and Warning Dictionary

This article provides a comprehensive list of error codes and warnings you may encounter while using the LC Phone System. It breaks down each code with clear explanations, common causes, and possible solutions to help you resolve delivery issues quic

Last updated: May 26, 2026

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  • What is the Error Code and Warning Dictionary?
  • 21211: Invalid 'To' Phone Number
  • 21408: Your account is not allowed to send SMS to this country or region
  • 21614: 'To' number is not a valid mobile number
  • 21635: The "To" number is a landline and cannot receive SMS
  • 21661: 'From' number is not SMS-capable
  • 30002: Message failed: your account is currently suspended.
  • 30003: Number unreachable or out of service
  • 30004: Recipient has opted out or has DND enabled
  • 30005: The recipient’s number is inactive or does not exist
  • 30006: Landline or unreachable carrier
  • 30007: Message filtered
  • 30008: Unknown error
  • 30011: MMS not supported by the receiving phone number in this region
  • 30023: Daily Message Cap Reached
  • 30032: Toll-Free Number Has Not Been Verified
  • 21610: Attempt to send to unsubscribed recipient
  • 30033: US A2P 10DLC - Campaign Suspended
  • 30037: Outbound Messaging Disabled
  • 21612: Message cannot be sent with the current combination of "To" and/or "From" parameters
  • 30034: Number not fully registered for A2P messaging. Please wait up to 24 hours after approval.
  • 21606: The 'From' phone number provided is not a valid message-capable phone number for this destination/account
  • Related Articles

In this folder

  • Phone System Pricing & Billing Guide
  • What is LC (Lead Connector) Phone System?
  • Number Intelligence - Spam Detection, Caller ID & SMS Validation
  • Voicemail For Company And For Users
  • Getting Started with A2P 10DLC
  • Call Forwarding to Your Bizura Phone Number
  • How do I migrate my agency and sub-account over to LC Phone?
  • Why is your account suspended
  • Regulatory Bundle and Address Creation for Sub-Accounts
  • How to Disable LC Phone System for Subaccount/Location (LC to Twilio)
  • Phone System Messaging Analytics Overview
  • Know Your Customer (KYC) in the United Kingdom
  • How to Enable Call Transcriptions for Recorded Calls
  • How to Set Up Verified Caller ID (Use your number for Voice Calls)
  • How to Configure SMS Compliance Settings
  • Physical VoIP Deskphones (SIP)
  • LC Phone System - Error Code and Warning Dictionary
  • Why You Can't Delete a Twilio Subaccount from the Bizura?
  • KYC Verification on Persona — Best Practices
  • Custom Dispositions for Voice Calls
  • Avoiding Call Loops when routing calls to Internal Phone Numbers
  • How to Reduce Inbound Spam Calls
  • How to use Custom CSS to hide the Twilio error banner
  • Setting up webhooks to receive incoming calls, messages and status updates for calls (for Twilio users)
  • Understanding Default Phone Preferences for New Sub-Accounts
  • How to Create and Use Call Scripts in Web & App Dialers
  • The Phone Dialer Overview
  • Moving Phone Numbers: Migration Guide
  • 5% Stripe Markup Removed From All Phone System Charges
  • Call Events Not Working for Twilio

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