Transferring your mobile number to a new phone
Whether you're getting a SIM only deal or a new handset contract, to keep your phone number, you'll need to transfer it to a new SIM. Thankfully, it's very simple to do.
Here's a quick step-by-step guide on how to keep your mobile number and use a PAC code.
Get your PAC code
Text 'PAC' to 65075 for free and you'll get a message back with your PAC code within two hours.
Find a deal you want to switch to, and give your new network your PAC code.
The network will now transfer your number over to your new SIM, job done!
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According to our own mobile phone statistics, a Uswitch survey from 2022 found that 38% of people change their phone every two years. However, changing your phone number can be a bit of a chore. The good news is you can avoid any hassle by moving your existing number to your new phone.
How do I transfer my mobile number?
Here's a step-by-step guide on how to move your current phone number to a new phone.
1. Text your current provider to request a mobile PAC code
A PAC code should be given to you immediately over the phone or within two hours by text. The telecommunications regulator stipulates this time frame. So, if you don't get it, you have cause to complain.
To prevent someone from stealing your number, networks will want to verify your identity. So expect to be asked some questions and have the relevant information to hand that’ll help you to answer quickly.
PAC codes are typically composed of nine digits and are valid for 30 days. If time runs out before you've had a chance to use the code you were supplied with, you’ll need to request a new PAC from your existing mobile provider.
Calls to networks to get your PAC code are charged at standard rates.
If the above seems like a bit of a hassle and you want a clean switch without having to speak to your existing provider, new government regulations have made the whole process a lot easier.
Text to Switch is simple. All you need to do is text 'PAC' to 65075, and you’ll receive your code immediately; you don’t even have to make a phone call.
2. Contact your new network and give them the PAC code
When you provide your PAC code to a new network, the cancellation process will begin automatically with your old network.
Once your new network has the code, it will contact the network you're leaving to inform them about the number transfer and schedule the switch.
This will generally be for the next working day. In the interim, keep your old SIM card in your phone so you can continue to use it to make calls and send texts.
If a weekend gets in the way, the porting process may take longer.
But generally, if you supply a carrier with a PAC Code on Friday, Saturday, or Sunday, the number transfer will be completed on the following Tuesday.
3. Check the SIM works in your phone and the new number has ported across
To do this, simply insert the SIM card into your handset and make a call. Or ask someone to give you a ring.
Alternatively, if you’re not fussed about keeping your phone number and want to switch for a fresh start, text 75075. You’ll get your Service Termination Authorisation Code (STAC), which ends your contract and leaves you free to switch to a new provider.
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Contact numbers to get your PAC code from your network
Text-to-switch isn’t for everyone. If you’d rather speak with your provider on the phone, you can always call them. We've included a range of options, depending on whether you're ringing from a landline, your mobile phone or from overseas.
You can also get information about switching networks and Text to Switch by texting 85075.
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Find your network PAC code
See a full list of networks and how to get your PAC code from them.
Get your network PAC code
Get your PAC code from EE
- Call 150 from an EE mobile phone
- Call 079 5396 6250 from any other phone (mobile or landline)
Get your PAC code from Three
- Call 333 from a Three phone
- Call 033 3338 1001 from any other phone (mobile or landline)
Get your PAC code from O2
- Call 202 from an O2 phone
- Call 034 4809 0222 from any other phone (mobile or landline)
Get your PAC code from Virgin Mobile
- Call 789 from a Virgin Mobile phone
- Call 034 5600 0789 from any other phone (mobile or landline)
Get your PAC code from Vodafone
- Call 191 from a Vodafone phone
- Call 033 3304 0191 from any other phone (mobile or landline)
Get your PAC code from BT Mobile
- Call 150 from a BT Mobile phone
- Call 0800 800 150 from any other phone (mobile or landline)
Get your PAC code from Plusnet Mobile
- Call 500 from a Plusnet Mobile phone
- Call 080 0013 2632 from any other phone (mobile or landline)
Get your PAC code from ID Mobile
- Call 7777 from an ID Mobile phone
- Call 033 3003 7777 from any other phone (mobile or landline)
Get your PAC code from Tesco Mobile
- Call 4455 from a Tesco Mobile phone
- Call 034 5301 4455 from any other phone (mobile or landline)
Get your PAC code from Sky Mobile
- Call 033 0041 2639 from Sky Mobiles, phones registered to other networks and landlines
Get your PAC code from giffgaff
- giffgaff doesn't operate customer support helplines. However, you can get a PAC code from giffgaff by mailing them using giffgaff's contact form.
Get your PAC code from VOXI
- VOXI is aimed at under 30s. So it's no surprise that you can only contact the network via Twitter, web chat and Facebook Messenger. To get your PAC code, head to VOXI's contact page.
Get your PAC code from SMARTY
- SMARTY doesn't have any customer service helplines. To get your PAC code, log into your SMARTY account.
Get your PAC code from Lebara
- Ring 5588 from your Lebara mobile. Rates are charged at 19p per call.
- Ring 020 7031 0791 from all other networks or from your landline.
Get your PAC code from Ecotalk
- Ring 033 3800 5500 from any UK mobile or landline.
What can go wrong when porting a number?
Porting a mobile number is usually straightforward, but problems can happen if something doesn’t line up between your old and new network.
Most problems are easy to fix once you know what’s caused them, and your number won’t be lost; it just means the switch takes longer than expected.
Common issues include:
- Incorrect details
If the name, account number or PAC code doesn’t match what your old network has on file, the transfer can fail.
- Expired PAC codes
PAC codes only last 30 days. Using an old one will stop the port from going through.
- Outstanding balances
Some networks won’t release your number if you have unpaid bills.
- Timing issues
Ports usually complete on a working day. Requests made late in the day or over a weekend may be delayed.
Why your PAC code might not work
If your PAC code isn’t accepted, it’s usually due to one of the following reasons:
- The code has expired – PAC codes are only valid for 30 days from the date they’re issued.
- You’ve entered it incorrectly – PAC codes are case-sensitive and must be entered exactly as provided.
- Your details don’t match – even small differences in name or address can cause the request to fail.
- Your account isn’t eligible – unpaid bills or a suspended account can block the transfer.
- The number type isn’t supported – some data-only or business numbers can’t be ported in the same way.
If this happens, your new network should inform you of the issue and the next steps. It is often as simple as requesting a new PAC code.
What happens if your number doesn’t transfer on time?
In most cases, your number should transfer by the end of the agreed switch date. If it doesn’t:
- You may temporarily keep your old SIM working longer than expected
- Or your new SIM may work with a temporary number
This can be frustrating, but it’s usually resolved within one or two working days.
If your number hasn’t transferred:
Contact your new network first
Ask if there’s a porting delay or mismatch causing the issue
Keep your old SIM until the transfer is fully complete
Can you cancel a port once it’s started?
Yes, but timing matters.
- If you change your mind before the switch date, you can usually cancel by contacting your new network.
- If the port is already in progress or scheduled for the same day, cancellation may not be possible.
Once a number has successfully transferred, it can’t be reversed, so it’s important to be sure before you give your PAC code to a new provider.
If you’re unsure, check with your new network as soon as possible. The earlier you act, the more options you’ll have.
Switching networks with a poor signal - what to check first
If you’re switching because of a poor signal, it’s worth checking a few things before you port your number:
- Coverage maps – check signal strength in the places you use your phone most, not just your postcode.
- Indoor coverage – some networks perform well outdoors but struggle inside buildings.
- 4G and 5G availability – make sure your handset supports the network’s latest coverage.
- Wi-Fi calling support – this can make a big difference if the mobile signal is weak at home.
- Network reliability – look at independent reports and user reviews, not just advertised coverage.
Doing these checks first can help you avoid switching to another network with the same signal problems and save you from having to port your number again.
Transferring your mobile phone number - myths busted
Still, have some queries or concerns about keeping your phone number? We field some of the most frequently asked questions in this section.
Will I lose service?
The porting process is designed to minimise the time you'll be without a service.
After you've supplied your new network with the PAC code, your old number will remain active. That means you'll still receive calls and texts.
However, when the number transfer is actually being processed, your service may be unavailable for a very short time.
When that happens, turn off and restart your handset for full service to be restored.
Can I transfer a disconnected number?
You cannot transfer disconnected numbers, so do not cancel your existing contract if you wish to port your mobile number.
What happens if my PAC code expires?
In the event that you don't get around to using your PAC code within the 30-day deadline for usage, there's nothing to worry about.
But you will have to contact the network you're leaving to request another PAC code, which you can then use to transfer your number.
How do I transfer my apps, music and games to my new phone?
If you've read the walkthrough above, you'll now know what you've got to do to port your existing number to the network you're joining.
However, when buying a new phone, you'll likely want to transfer all your apps, games, movies, music, and settings from your old phone as well.
That'll mean making a backup of your current phone, and then setting up your new phone using the backup.
To help you, we talk you through the process with our one-stop guides:
How do I transfer my contacts to my new phone?
Inputting hundreds of contact details into a new phone is no one's idea of fun.
To make sure that's not a plight that affects you, it's critical that you back up your contacts that are on your old SIM before you start using your new one.
The first step is to check whether your contacts are saved on your SIM or on your phone.
The surefire way to do this is to simply take your SIM out. If you can still see your contacts, it means they're saved on your phone. Can't see them? That means they're on the SIM.
Assuming they're saved on the phone that you'll no longer be using, you'll need to back them up. We'd recommend using a cloud storage service. Or, if you've got an Android phone, you might be able to use a microSD card.
In the event that they're stored on the phone and you're keeping your old phone and just switching to a new SIM only deal on a new network, you don't need to do anything. Simply input the new SIM in your phone, and your contacts will be there.
If they're stored on your SIM, you'll need to transfer them so they're stored on your phone.
This is easy enough to do. Just head to the settings section of your handset, and you should find an option to 'copy contacts' or 'import contacts'.
I've heard I can request my PAC code by text message. Is that correct?
It is. As we mentioned earlier, as of 1st July 2019, you can request your PAC code just by sending a text message to 65075.
The telecoms regulator has introduced the 'Text to Switch' system with the intention of streamlining the switching process.
The key advantage is that you'll no longer have to phone your provider and speak to a sales rep from the network you're leaving, whose job it is to persuade you to stay.
Porting your mobile number when buying online
If you are buying your new mobile online, you should still be able to port your mobile number using the following simple steps:
- Request your PAC code from your existing network and make a note of it.
- Select a mobile handset and network tariff combination that suits you and order online.
- You will be sent your phone once you have passed any necessary credit checks.
- Get connected by following the instructions on your new mobile.
- Once connected, you will have a temporary mobile number.
- Contact your new network or service provider quoting your temporary number, the number you wish to Port and the PAC provided by your old network.
- Your existing number will then be transferred within a few working days, sometimes even the next working day.
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FAQs
How long does a PAC code last?
Once you receive your PAC code it will be valid for 30 days, giving you a month to give it to your new network.
Can I use a PAC code after it expires?
Unfortunately you can't use a PAC code after it expires. If you fail to use it after 30 days then you will need to request another one from your current network.
Will I lose service during a switch?
When switching your mobile number it is possible that you will experience a brief service disruption that could last a few minutes to a few hours.
Can I keep my number on a SIM only deal?
Yes you can and the good news is it is very simple to do so.