Number Porting Guide -What to Expect and How We Work With You

Purpose

This guide explains how CallTower manages number porting and what is needed from you to ensure a smooth and timely transition of your phone numbers.

Number porting is a coordinated process involving CallTower, your current carrier, and industry partners. Clear information, accurate documentation, and timely communication are essential to avoid delays and service disruption.

This guide applies to:

• Domestic, toll‑free, and international ports
• Customers both before and after service activation

Overview of Number Porting at CallTower

Local Number Portability (LNP) allows you to keep your existing phone numbers when moving service to CallTower.

Porting is a multi‑step process that depends on:

• Accurate information from your current carrier
• Proper setup of your CallTower services
• Coordination with external carriers

A successful port requires:

• Complete and correct documentation
• Clear confirmation of dates and timing
• Coordination between all parties involved

Getting Started: What We Need From You

Providing accurate information upfront is the most important step in a successful port.

Before your request is submitted, we will confirm:

• Your account status and readiness
• That all required documents are complete and current
• That the requested port date falls within standard timelines

If any information is missing or incorrect, the port may be delayed until it is corrected.

What CallTower Does During the Porting Process

Once your request is submitted:

• CallTower submits your port request to your current carrier
• Your carrier reviews the request and either approves it or requests corrections
• Once approved, your carrier provides a Firm Order Commitment (FOC) confirming the port date
• CallTower prepares your service so numbers can be activated on the scheduled date

On the day of the port:

• The port is monitored to completion
• Test calls are performed when possible
• You are notified once the port is complete

Porting Timelines & Operating Hours

Required Documentation & Quality Standards

Required Documents

To submit a port request, the following are required:

• Letter of Authorization (LOA)
  • Signed and dated within the last 30 days
  • Must list all numbers being ported
• Invoice or Customer Service Record (CSR)
  • Dated within the last 30 days

Incomplete or outdated documents are a common cause of delays.

Number Formatting Requirements

• Domestic numbers: 10‑digit format, no spaces or special characters
• International numbers: Listed individually with country code (no “+”)

Port Dates

• A requested port date is required for all ports
• Dates must fall within standard operating hours and timelines

International Porting Requirements

International ports often require additional documentation, which varies by country.

Examples may include:

• Country‑specific LOA forms
• Proof of identity
• Business registration documents
• Full service address

These requirements must be provided before submission to avoid delays.

Tools & Systems Used by CallTower

To manage your port, CallTower uses industry‑standard systems to:

• Track your request
• Coordinate with carriers
• Prepare your service for activation

You do not need direct access to these systems — CallTower manages this on your behalf.

Support & Resources

If you have questions during the porting process:

• Your CallTower representative will keep you informed of progress
• Additional information may be requested if required by your carrier

Helpful resources:

• Number Porting Tips & Best Practices
•  How to Intiate a Port Order or Request New Numbers 

Final Note

Number porting is a regulated process involving multiple carriers and systems. While timelines may vary, providing complete and accurate information upfront greatly reduces delays and helps ensure a smooth transition.

CallTower is committed to guiding you through the process and minimizing disruption whenever possible.