Switch networks without losing your number.
Switching mobile networks doesn’t have to mean starting from scratch. Whether you’re chasing better coverage, lower prices, or a shiny new deal, it’s entirely possible to move to a new provider without losing your current number.
This guide walks you through everything you need to know – from getting your PAC code to activating your new SIM – so you can make the switch smoothly and stress-free.
Why keep your number when switching?
One of the biggest deterrents to switching mobile networks is the fear of losing your number. After all, it’s not just a string of digits – it’s tied to your identity.
Friends, family, colleagues, and even businesses have it saved, and changing it can mean hours of updating contacts, notifying services, and re-verifying accounts. Keeping your number makes the transition virtually invisible to the outside world.
Your mobile number is also connected to a wide range of digital services. From online banking and two-factor authentication to social media accounts and delivery apps, many platforms rely on your mobile number for verification and communication. Changing it could lead to missed security alerts, failed logins, or confusion when services try to contact you.
Finally, and maybe more specific to certain individuals, keeping your number simplifies the admin involved in switching. Whether you’re an individual or running a business, keeping your number offers both practical and professional continuity with zero disruption.
You don’t have to worry about creating new business cards, reprinting forms, or updating your number across email signatures and customer databases.
What you’ll need before you switch
In order to make the switch happen, you’ll need a few things from both your existing provider and the new provider.
Your current mobile number
This seems rather obvious, but the first thing you’ll need is your current mobile number. It will be required to get the next thing you’ll need, which is…
A PAC code from your existing provider
The second and most important thing you’ll need is your PAC code, short for Porting Authorisation Code. This nine-character code is issued by your current provider and allows your number to be transferred to a new network.
Getting it is easier than ever thanks to Ofcom’s “Text to Switch” service: simply text PAC to 65075 and you’ll receive your code via SMS, usually within 60 seconds. The code is valid for 30 days, so you have time to choose and activate a new plan.
A new SIM or plan with your chosen network
Finally, you’ll need a new SIM card or an eSIM with your chosen network. Most providers allow you to either enter your PAC code when you sign up or apply it afterward through your account dashboard.
Most major UK networks support number portability, so the switch can usually happen within one working day.
Make sure your phone is unlocked or compatible with the new network, and check the coverage and plan benefits to avoid surprises. Ensuring your phone isn’t locked is critical, so be sure to check it, and if it is, you’ll need to unlock your mobile before switching over to a new network.
Step-by-step to keeping your number
1. Request a PAC code from your current provider
Make the request to your current provider to receive your PAC code (process to do so is listed above).
That code is valid for 30 days, so you can do this first and sort out other things later.
2. Choose your new network provider
If you don’t already have a new network provider in mind, you can do some research to find the right one for you. It’s important to go for something where you know the coverage will be suitable for you – essentially, you don’t want to go with a provider whose network offers a poor connection in your area.
You should also check for the right deal for you. Think of your needs for your new SIM; how much data you need and how many minutes and texts you’ll want (although those are typically set to unlimited on the majority of plans these days).
Once you’ve decided, order your new SIM, or opt for an eSIM, which eliminates the need of a physical SIM card.
3. Provide the PAC Code to Your New Provider
When your ordering your new SIM or eSIM, at some point during checkout it will ask you if you have a PAC code ready to submit. If it does, be sure to do so as this will ensure your new SIM/eSIM is setup with your current number.
If it doesn’t have this step during checkout, you should be able to do this via your online account with your new network. Again, there should be a section to submit your PAC code.
Whether you were able to submit your PAC code at checkout or on your online account, once you have done so, it will ask for the mobile number you want to transfer. Enter in your number, and it should start the process.
4. Wait for the Transfer
Once you’ve submitted your PAC code and entered your number, the transfer process will begin.
It typically takes within one business day to be completed, and in that time your old service should still be operating up until the number switch is complete.
5. Test Your New SIM/eSIM
Insert your new SIM card or activate your new eSIM and check to see all is in order. You should try making a test call or sending a text to someone to confirm your number has moved over successfully.
6. Check for Disconnection
Finally, check that your old account has been closed successfully. It should be done automatically once the transfer is complete, but if not you should contact your old provider.
You should also get in touch to make sure there are no outstanding charges on your account. You don’t want to get caught out with secret charges!
Common FAQs
Can I switch if I’m on Pay As You Go?
Absolutely. Just follow the same PAC code process.
Can I request my PAC code any time?
Yes — just text PAC to 65075 from your current number, and you’ll receive it within 60 seconds. Providers are legally required to issue your PAC within two working hours of your request.
How long does the number transfer take?
Once you provide your PAC to the new provider before 5 pm on a working day, the transfer typically completes by the next working day. If submitted later or on weekends, it may take two working days.
Will I lose service during the switch?
Not significantly. Your old SIM remains active until the switch is finalized. You may experience a brief interruption, usually just a minute or so.
Should I cancel my old contract myself?
No need – submitting a PAC triggers your new provider to cancel the old account for you. There’s no need to call or email your old carrier.
What if I’m still under contract?
You can switch mid-contract, but be aware of early termination fees. It’s wise to check your contract terms; waiting until the final 30 days could avoid extra charges.
Can I keep my number when switching to a SIM‑only plan?
Yes. Just request a PAC code and port the number to your SIM‑only plan. Internal upgrades (e.g., PAYG → SIM-only on the same network) may follow a different process.
Do I need to unlock my phone?
Post-2021, most new phones are sold unlocked. If your device is locked or was purchased before December 2021, request unlocking from your current provider.
Can I cancel the PAC code request?
Yes. a PAC code isn’t actioned until given to the new provider. If you change your mind, simply don’t submit it. If you’ve already submitted, there’s typically a 14-day cooling-off period with your new provider. Be sure to check your new providers’ terms and conditions when joining.
What if I don’t submit the PAC code in time?
Once the 30-day validity expires, you’ll need to request a new PAC to proceed with the transfer.
Will my voicemails or voice notes transfer?
Generally, voicemails won’t carry over, and there’s no standard method to transfer them. It’s best to save important ones locally before switching.
