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Voicemail article coming soon

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Coming soon.

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20003 - Credentials are invalid or the account has been suspended
21211: Invalid 'To' Phone Number
21408: Your account is not allowed to send SMS to this country or region.
21606: The 'From' phone number provided is not a valid message-capable phone number for this destination/account
21610: Attempt to send to unsubscribed recipient
21612: Message cannot be sent with the current combination of "To" and/or "From" parameters
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
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
30033: US A2P 10DLC - Campaign Suspended
30035: Number not fully registered for A2P messaging. Please wait up to 24 hours after approval.
30037: Outbound Messaging Disabled
A2P 10DLC Brand Approval Best Practices
A2P 10DLC Campaign Approval Best Practices
A2P Opt-In Form - Privacy Policy and Terms and Conditions Guidelines
Agency SMS Warm-Up Period & Daily Limit
AI-Powered A2P Compliance Validation
Avoiding Call Loops when routing calls to Internal Phone Numbers
Best Practices Around Periodically Sending Opt-Out Texts and Sender IDs
Best Practices for SMS deliverability and Avoiding SMS Restrictions
Billing Statement Help
Brand Registration Step by Step Guide and FAQs
Calculating SMS and MMS Costs: A Step-by-Step Guide
Call Dispositions
Call Forwarding to Your LeadConnector Phone Number
Call Recording Storage
Call Transcriptions for Recorded Calls
Campaign Rejection Reasons and Resolutions
Choosing between using your existing phone number vs buying a new phone number
Configuring Sender ID and Opt-Out Language for SMS Compliance
Custom Module Visibility by Role & Location
Detailed Pricing for A2P 10DLC Registrations
Error 30034: Number not A2P compliant. Please register for A2P
Forbidden message categories for SMS and MMS in the US and Canada
How to buy a toll free number?
How to get your phone number A2P approved in 2026
How to Prevent SMS Filtering by Carriers: Error 30007
How to Purchase a Phone Number for Your Business
How to Reduce Inbound Spam Calls
How to Set Up Call Tracking (Number Pool)
How to Set Up Verified Caller ID (Use your number for Voice Calls)
How to submit a Campaign for A2P 10DLC ?
Identity Verification for Phone Number Purchases (US/CA/PR/IL)
Improve your Phone Number's reputation with Voice Integrity
Inbound Calls: IVR, AI, Routing & Call Flow Explained
Know Your Customer (KYC) in the United Kingdom
KYC Verification on Persona — Best Practices
LeadConnector Messaging Policy
List of campaign use case types for A2P 10DLC registration
Message throughput (MPS) and Trust Scores for A2P 10DLC in the US
Microphone permission on different browsers
Number Intelligence: number validity, detect spam calls and look up unknown caller name
Opt-In Methods & Their Compliance Requirements
Phone Number Edit Configuration (Incoming Calls Settings)
Phone Number Settings Explained
Recommendations and Best Practices for Maintaining a Positive Caller Reputation
Regulatory Bundle and Address Creation for Sub-Accounts
Remediate 'Spam Likely' on your Caller ID using Voice Integrity
Texas Mini-TCPA Law: What You Need to Know (Effective Sept. 1, 2025)
Toll-Free Verification Guide for LC - Phone (US/Canada)
U.S. A2P 10DLC Messaging Registration Mandatory, Effective from July 5, 2023
Updated Messaging Guidelines for the U.S. & Canada
Use Your Existing Phone Number to Place Voice Calls
Voice calling with Lead Connector
Voicemail article coming soon
VoIP Deskphones (SIP endpoints)
Website Compliance Guide
What is A2P 10 DLC- Brand and Campaign Registration
What is A2P 10DLC?
What is CNAM?
What is SHAKEN/STIR?
Why are my Calls marked as Spam and how can I avoid it
Why are my Calls marked as Spam, and How can I avoid it ?
Why doesn’t my Business Name display after CNAM registration?
Why Was My Toll-Free Verification Rejected?