LOA (Letter of Authorization) for Number Porting: Complete Guide
📄 Summary: A Letter of Authorization (LOA) is the essential legal document that permits your new VoIP provider to port your phone numbers from your current carrier. This guide covers everything you need to know: what an LOA is, required fields, step-by-step filling instructions, common mistakes that cause rejections, validity periods, and a sample template. Master the LOA process and avoid porting delays.
📖 Table of Contents
- 1. What is a Letter of Authorization (LOA)?
- 2. Why is an LOA Required?
- 3. Required Fields on an LOA
- 4. How to Fill Out an LOA (Step-by-Step)
- 5. LOA Validity Periods
- 6. Common Mistakes & Rejection Reasons
- 7. Best Practices for LOA Success
- 8. Sample LOA Template
- 9. FAQs (Google & LLM Answers)
- 10. Related Resources
When you decide to switch your business phone numbers to a new VoIP provider, one document stands between you and a successful port: the Letter of Authorization (LOA). This seemingly simple form is actually a legally binding document that gives your new carrier permission to request a number port from your current carrier on your behalf.[reference:0]
The LOA, also referred to as a Letter of Agency, is mandated by the Federal Communications Commission (FCC) under the Telecommunications Act of 1996 to ensure consumers can seamlessly switch between providers while preventing unauthorized number transfers (known as "slamming").[reference:1][reference:2] It serves as the official legal foundation for the entire porting process, protecting both you and the carriers involved.[reference:3]
Getting your LOA right is critical. A single error — a mismatched address, a missing signature, or an incorrect account number — can delay your port by days or even weeks. This guide walks you through every field, every requirement, and every common pitfall so you can submit a perfect LOA and port your numbers without hassle.
🔒 Why is an LOA Required?
The LOA exists to protect you. Without a signed LOA, your new carrier cannot legally request a port from your current carrier.[reference:4] It verifies that the phone number's rightful owner has authorized the transfer.[reference:5] Here's why it matters:
✅ Prevents Unauthorized Ports
The FCC requires carriers to obtain verifiable authorization before porting any number.[reference:6] The LOA ensures that only the authorized account holder can initiate a port, protecting you from fraud and "slamming."[reference:7]
✅ Legal Permission for the New Carrier
The LOA grants your new provider the legal authority to act on your behalf and access your account information from the losing carrier.[reference:8] This allows them to complete the porting process smoothly.
✅ Ensures Accurate Information
The LOA forces you to provide exact, verified information (name, address, account number) that must match your current carrier's records — reducing errors that cause delays.[reference:9]
📋 Required Fields on an LOA
Every LOA must contain specific information to be considered valid. According to FCC rules and industry standards, the following fields are required[reference:10][reference:11]:
| Field | Description | Critical Notes |
|---|---|---|
| Account/Company Name | The exact name on file with your current carrier | Must match the losing carrier's records exactly[reference:12] |
| Service Address | Physical location where the numbers are used | Use the service address, not billing address (unless same)[reference:13] |
| Current Carrier Name | Name of your existing provider | Be specific — e.g., "Verizon Business" not just "Verizon"[reference:14] |
| Billing Telephone Number (BTN) | The primary number on the account | This is the "anchor" number for the account[reference:15] |
| Numbers to be Ported | All phone numbers being transferred | List in NPA-NXX-XXXX format, separated by commas[reference:16] |
| Authorized Signature | Signature of the authorized person | Must be clear and legible — wet or valid e-signature[reference:17][reference:18] |
| Printed Name | Full name of the signer in block letters | Must match the account holder name[reference:19] |
| Date | Date the LOA was signed | Must be within validity period (see below)[reference:20] |
✍️ How to Fill Out an LOA (Step-by-Step)
Follow these steps to complete your LOA accurately[reference:21]:
⏳ LOA Validity Periods
Your LOA and supporting documents must be recent to be accepted. Different documents have different validity requirements[reference:31]:
| Document | Maximum Age | Notes |
|---|---|---|
| LOA Signature Date | 90 days | Must be signed within the last 90 days[reference:32] |
| Invoice or Bill | 30 days | Must be from your current carrier within the last 30 days[reference:33] |
| Customer Service Record (CSR) | No strict limit | But recent is better[reference:34] |
⚠️ Important: FCC regulations mandate that LOAs used for number hosting cannot be older than 30 days.[reference:35] While the general industry standard allows 90 days for the signature, some carriers may enforce stricter limits. Always check with your new provider.
❌ Common LOA Mistakes & Rejection Reasons
Even small errors can cause your port request to be rejected. Here are the most common reasons for LOA rejection and how to prevent them[reference:36][reference:37]:
| Rejection Reason | How to Prevent It |
|---|---|
| Name mismatch | Use the exact name from your CSR or carrier records — including suffixes like "LLC" or "Inc."[reference:38] |
| Address mismatch | Use the service address on file with your carrier, not your billing address (unless they are the same)[reference:39] |
| Missing or illegible signature | Ensure the authorized person signs clearly. Wet signatures or valid e-signatures are accepted.[reference:40][reference:41] |
| LOA not signed | Always have the authorized account holder sign the LOA before submission.[reference:42] |
| Incorrect account number | Verify your account number with your current carrier before submitting.[reference:43] |
| Numbers not listed on LOA | Include ALL numbers you want to port. For large lists, attach an Excel spreadsheet.[reference:44][reference:45] |
| Signature too old | Sign within the last 90 days.[reference:46] |
| Missing invoice/bill | Upload a recent bill or acceptable alternative (portal screenshot, CSR).[reference:47] |
🏆 Best Practices for LOA Success
- Request a CSR first. Before filling out any LOA, obtain a Customer Service Record from your current carrier. This document contains your exact account information and prevents mismatches.[reference:48]
- Use the service address, not billing address. Many rejections happen because the address on the LOA doesn't match the carrier's service address record.[reference:49]
- List all numbers exactly. Use NPA-NXX-XXXX format. For 20+ numbers, attach a separate Excel file.[reference:50]
- Ensure the right person signs. The signer must be the authorized person on the account with the losing carrier.[reference:51]
- Keep documents recent. Sign the LOA within 90 days and provide a bill within 30 days.[reference:52][reference:53]
- Save as non-editable PDF. When submitting, save the LOA as a PDF to prevent formatting changes.[reference:54]
- Toll-free numbers need special LOAs. For toll-free ports, the LOA must include the RespOrg ID (e.g., "Port to RespOrg QIT02").[reference:55][reference:56]
- For business accounts, ensure signer has authority. The authorized person must have full authority to act on behalf of the business.[reference:57]
🚀 Let NetviaVoice Handle Your LOA and Number Porting
Our dedicated porting team prepares your LOA, verifies all details against carrier records, and manages the entire porting process. No rejections, no delays.
Visit NetviaVoice📄 Sample LOA Template
Here's a simplified template showing the typical structure of an LOA. Always use the specific form provided by your new carrier:
❓ 5 Frequently Asked Questions About LOA for Number Porting
An LOA (Letter of Authorization) is a legal document that authorizes a new telecom provider to request a number port on your behalf. It gives the winning carrier permission to transfer your phone numbers from your current (losing) carrier.[reference:58]
An LOA requires: account holder or company name, service address (not billing address unless same), current carrier name, Billing Telephone Number (BTN), all numbers to be ported, authorized signature, printed name, and date.[reference:59]
Most carriers require the LOA signature to be within the last 90 days.[reference:60] The accompanying bill or invoice must be within the last 30 days.[reference:61] FCC regulations mandate that LOAs used for number hosting cannot be older than 30 days.[reference:62]
Common rejection reasons include name/address mismatch, missing or illegible signature, incorrect account number, or numbers not listed.[reference:63] Your new provider will notify you of the rejection reason so you can correct and resubmit.[reference:64]
Yes, toll-free numbers typically require a separate LOA. The LOA must include the specific RespOrg ID of the new provider (e.g., "Port to RespOrg QIT02") and may take 3-7 business days to process.[reference:65][reference:66]
📢 Need a perfect LOA for your number port? Let NetviaVoice handle it — no rejections, no delays.