Thinking about switching your mobile network but want to keep your number? In the UK, obtaining a PAC (Porting Authorisation Code) is the key to a hassle-free transfer from one provider to another.
Whether you’re unhappy with Three’s services or found a better deal elsewhere, getting your PAC code is a simple yet essential step in the process.
Mobile number portability regulations in the UK ensure that you can switch providers without losing your number, making the transition smoother. But how exactly do you request a PAC code from Three?
What steps should you take to ensure a seamless transfer? This guide will walk you through everything you need to know, from understanding what a PAC code is to using it correctly when switching networks.
What is a PAC Code?

A PAC code, or Porting Authorisation Code, is a unique nine-digit code provided by your current mobile network when you request to transfer your number to another provider.
It allows you to retain your existing phone number when switching, preventing the inconvenience of informing all your contacts about a new number.
Why is a PAC Code Needed?
- Ensures a smooth transfer of your mobile number to a new network.
- Prevents the need for a new phone number when changing providers.
- Required by all major UK mobile networks for number porting.
Where Can You Use a PAC Code?
- When moving from Three to another network like Vodafone, EE, O2, or a virtual operator.
- When switching from a pay-monthly contract to a new provider.
- When transferring from a PAYG (Pay As You Go) SIM to a new service.
Understanding how a PAC code works will help ensure a hassle-free number transfer when switching networks.
How Does a PAC Code Work?
A PAC code functions as an authorisation token that allows your new network to request the transfer of your mobile number.
Once issued by your current provider, you must give the code to your new network within a specific timeframe for the process to be completed.
Step-by-Step Process of How PAC Codes Work
- Request the PAC Code: Contact your current provider (Three in this case) and request your PAC code through SMS, online, or by phone.
- Receive the PAC Code: You will receive your unique PAC code within a few minutes via text message.
- Provide the PAC Code to Your New Network: Share the code with your new mobile provider to initiate the transfer.
- Number Transfer Process Begins: Your new network processes the request, and the number transfer usually takes one working day.
- Old SIM Stops Working: Once the transfer is completed, your Three SIM will be deactivated.
PAC codes are valid for 30 days from the date of issue. If not used within this timeframe, you must request a new one.
How to Get PAC Code from 3?

Requesting a PAC code from Three is straightforward. There are multiple ways to do this, depending on your preference and ease of access.
Methods to Request a PAC Code from Three
1. Get a PAC Code via SMS
- Text “PAC” to 65075 from your Three number.
- You will receive your PAC code instantly via text message.
2. Get a PAC Code Online
- Log in to your Three account via the website or mobile app.
- Navigate to the switching or PAC code request section.
- Follow the on-screen instructions to receive your PAC code.
3. Get a PAC Code by Calling Three
- Dial 333 from your Three phone or 0333 338 1001 from another phone.
- Speak to a customer representative and request a PAC code.
Most users prefer the SMS method since it is the fastest and does not require speaking to customer service.
Is There Any Cost to Get a PAC Code from Three?
Obtaining a PAC code from Three is entirely free. UK mobile network regulations ensure that all operators provide PAC codes at no cost to customers who wish to switch providers while keeping their phone numbers.
This rule prevents networks from imposing hidden charges to discourage users from leaving.
However, while the PAC code itself is free, customers should be aware of any financial obligations tied to their existing Three account before making the switch. These may include:
- Early Termination Fees: If you are still under a fixed-term contract, leaving early may result in exit fees. These charges vary depending on the remaining months in your contract and your monthly payment plan.
- Outstanding Bills: Any unpaid bills on your account must be settled before switching. This includes monthly plan charges, extra usage fees, and any overdue payments.
- Device Payment Plans: If you purchased a handset through Three and are paying for it in installments, you may need to clear the remaining balance before transferring your number to a new provider.
To avoid unexpected costs, it is advisable to check your Three account status before requesting a PAC code.
If you are unsure about any pending payments or exit charges, Three’s customer service can provide a detailed breakdown of your financial obligations.
How Long Does It Take to Receive a PAC Code from Three?

The time taken to receive a PAC code from Three depends on the method used to request it. The fastest and most convenient way is via SMS, but other options are available for those who prefer online or phone requests.
Methods and Expected Timeframes for PAC Code Requests
- By SMS: The quickest method. Simply text “PAC” to 65075 from your Three number, and you will receive the PAC code almost instantly.
- Online Request: If you log in to your Three account via the website or mobile app and request a PAC code, it typically arrives within a few minutes.
- By Phone Call: Calling Three’s customer service at 333 from a Three phone or 0333 338 1001 from another phone is another option. The time taken depends on call waiting times, but you should receive the PAC code immediately after speaking to a representative.
According to UK mobile regulations, all network providers must issue a PAC code within two hours of the request, provided it is made during business hours.
If you do not receive the PAC code within the expected timeframe, it is advisable to check for network delays or contact Three’s support team for assistance.
How to Use a PAC Code to Transfer Your Number?
Once you have received your PAC code, you can proceed with transferring your number to a new network. The process is simple, and most number transfers are completed within a working day.
Steps to Transfer Your Number Using a PAC Code
- Choose a New Mobile Provider: Select a new mobile network and sign up for a plan. This can be a pay-monthly or PAYG (Pay As You Go) plan.
- Provide the PAC Code: Once your new account is set up, give the PAC code to your new network. This can usually be done online, through a mobile app, or via customer service.
- Wait for the Number Transfer: The new provider will process your PAC request. The number transfer usually takes one working day, though it may take longer if the request is made during weekends or bank holidays.
- Old SIM Deactivation: Once the number transfer is completed, your Three SIM will stop working, and your new SIM will have your existing number.
If the transfer is not completed within the expected timeframe, you should contact your new provider to check the status.
In rare cases, delays may occur due to technical issues, but most transfers happen smoothly within a day.
What Happens If You Don’t Use Your PAC Code?

If you receive a PAC code but do not use it within 30 days, it will automatically expire. This means that your existing Three service will remain active, and your number will not be transferred to another network.
An expired PAC code does not affect your Three account in any way. If you decide to switch at a later date, you simply need to request a new PAC code.
There is no limit to how many times you can request a PAC code, but each code is only valid for one month from the date of issue.
If you change your mind about switching networks and decide to stay with Three, you can continue using your current plan without interruption.
However, if you manually cancel your Three plan without using a PAC code, your number may be lost permanently unless you arrange for its retention beforehand.
Can You Get a PAC Code If You’re in a Contract with Three?
Yes, you can request a PAC code from Three even if you are still in a contract. However, leaving before your contract ends may result in financial penalties.
Things to Consider Before Requesting a PAC Code While Under Contract
- Check Your Contract End Date: If your minimum contract term is not yet complete, you may have to pay an early termination fee before switching.
- Calculate Early Exit Charges: The termination fee usually depends on the number of months left in your contract. Some providers charge the full monthly fee for each remaining month, while others may offer discounts on exit fees.
- Settle Any Outstanding Bills: If there are unpaid bills on your account, Three may refuse to process the PAC request until the balance is cleared.
If you are on a rolling monthly or PAYG plan, you can request a PAC code and switch at any time without extra fees.
Always review your contract terms before making a decision to ensure there are no unexpected costs involved.
Alternative Ways to Switch Networks Without a PAC Code

If you do not want to keep your existing mobile number when switching networks, you do not need a PAC code. Instead, you can request a STAC code (Service Termination Authorisation Code).
Difference Between a PAC Code and a STAC Code
- PAC Code: Used when you want to transfer your mobile number to a new network.
- STAC Code: Used when you want to cancel your Three account and get a new number from your new provider.
To request an STAC code, text “STAC” to 75075, or log in to your Three account and select the termination option.
Unlike a PAC code, a STAC code will completely cancel your existing number, so once the switch is completed, you will be assigned a new number by your new network.
A STAC code is useful if you are experiencing persistent issues with spam calls, wish to start fresh with a new number, or do not need to retain your current mobile number for personal or business use.
However, if you mistakenly request a STAC code instead of a PAC code, you will lose your existing number permanently.
Conclusion
Switching mobile networks while keeping your number is easier than ever with a PAC code. Three offers multiple ways to request a PAC code, including SMS, online, and by phone.
Once received, the PAC code must be given to your new provider within 30 days to complete the number transfer.
Before switching, ensure there are no outstanding charges on your account, especially if you are under contract.
If you do not wish to keep your number, a STAC code can be used instead. Following these steps will help you move to a new network without any complications.
FAQs
How long is a PAC code valid for?
A PAC code is valid for 30 days from the date of issue.
Can I request a PAC code if I have unpaid bills with Three?
Yes, but you may need to settle outstanding bills before completing the transfer.
Will my service be disrupted while using a PAC code?
No, your current service will continue until the transfer is complete.
What should I do if my PAC code is not working?
Contact your new provider to check if the code is entered correctly or request a new one from Three.
Can I cancel my PAC code request?
Yes, if you change your mind, simply do not use the PAC code, and it will expire in 30 days.




