PAC Codes Explained: What Those 9 Characters Mean and How to Use Them When Switching Mobile

What Is a PAC Code and Why Do You Need One?

When you're switching mobile providers but want to keep your existing phone number, you'll encounter something called a PAC code. This nine-character code is your key to taking your number with you, but many people find the combination of letters and numbers confusing when they first see it.

A Porting Authorisation Code (PAC) is a nine-character alphanumeric code that enables you to transfer your mobile phone number from one network provider to another in the UK^[1]. Without this code, you'd have to start fresh with a new number when switching providers.

Breaking Down the PAC Code Format

Every PAC code follows the same structure: three letters followed by six numbers (for example, ABC123456)^[1]. This isn't random - the format is standardised across all UK mobile networks to ensure the porting process works smoothly between different providers.

The letters don't represent your provider or contain hidden meaning about your account. They're simply part of the unique identifier that authorises the transfer of your specific number. The six numbers that follow complete this unique code, ensuring no two PAC codes are identical.

Your PAC code is valid for 30 days from the date it's issued^[1]. After this period expires, you'll need to request a new one if you still want to switch providers while keeping your number.

How to Request Your PAC Code

Getting your PAC code is straightforward. Simply text 'PAC' to 65075 from the mobile number you want to keep^[2]. Your current provider must respond within two working hours with your code and details of any early termination charges that might apply^[2].

This process is regulated by Ofcom, so all UK mobile providers must follow the same rules. You don't need to speak to anyone or justify why you're leaving - the text request is sufficient, and providers cannot refuse to issue your code.

When you receive your PAC code, you'll also get information about any costs involved in leaving your current contract early. This transparency helps you make an informed decision about whether to switch immediately or wait until your contract ends naturally.

Using Your PAC Code to Switch Providers

Once you have your PAC code, the switching process involves three key steps:

Step 1: Choose Your New ProviderSelect the mobile network you want to switch to. This might involve comparing different tariffs, coverage areas, or special offers. Some people also consider whether they want additional services - for instance, some providers offer broadband only deals no landline options as part of bundle packages.

Step 2: Provide Your PAC CodeDuring the sign-up process with your new provider, you'll be asked for your PAC code. Give them the nine-character code exactly as you received it. This authorises the transfer of your number^[2].

Step 3: Wait for the TransferOnce your new provider has your PAC code, the number transfer typically completes within one working day, provided the request is submitted before 5pm on a weekday^[2]. Your old service will automatically terminate when the new one becomes active.

Services like Lodo can handle this entire switching process for you, including managing the PAC code submission and coordinating with both your old and new providers to ensure a smooth transition.

Understanding Early Termination Charges

If you're still within a contract period when you request your PAC code, early termination charges may apply^[2]. These charges cover the remaining months of your minimum contract term and will be clearly stated when you receive your PAC code.

Sometimes these charges can be substantial, so it's worth calculating whether the savings from switching immediately outweigh the cost of leaving early. In some cases, waiting until your contract expires naturally might be more economical.

Alternative: STAC Codes for New Numbers

If you're happy to get a new number rather than keeping your existing one, you can request a STAC (Service Termination Authorisation Code) instead. Text 'STAC' to 75075 to receive this code^[2].

STAC codes work similarly to PAC codes but terminate your current service without transferring your number. This can sometimes be faster and may avoid certain administrative complications, though you'll lose your existing number permanently.

What About Broadband and Other Services?

It's important to note that PAC codes only apply to mobile services. If you're also considering switching broadband providers, this involves a separate process entirely. Many providers now offer short term broadband options or no contract wifi deals that can provide flexibility while you're making decisions about longer-term services.

For those looking to understand their current usage before switching, an electricity consumption calculator can help evaluate energy needs, while utility price comparison uk services can help identify potential savings across multiple services.

When moving house, some providers like Virgin Media have specific processes for transferring services to your new address, which is different from switching providers entirely.