How to Keep Your Phone Number When Changing SIMs

Switching mobile networks or SIM cards can be a hassle, but keeping your existing phone number makes the transition smoother. Retaining your number is not only convenient but often essential for staying in touch with friends and family and maintaining work contacts. Fortunately, both the US and the UK mobile networks have established processes to help you keep your phone number when going for one of the best SIM-only deals.

Here’s a step-by-step guide on how to do it.

How to keep your phone number in the UK

Via text

In the UK, the process of keeping your phone number is straightforward, thanks to the Porting Authorisation Code (PAC) system. Here’s how it works:

To get your PAC code via SMS, text “PAC” to 65075. Providers are legally obligated to provide a PAC code immediately via SMS or within two hours if you request it online or over the phone.
Once you’ve received your PAC code (valid for 30 days), give it to your new network provider. Most providers allow you to submit the PAC code online or through their customer service.
The porting process usually takes one working day. You may experience a brief service disruption while the number is being transferred.
Keep in mind that your old contract will automatically terminate when the porting process is complete. Ensure there are no outstanding bills with your current provider to avoid delays.

Via call

If, for whatever reason, you don’t want to use the streamlined text service, you can also phone your current UK network provider. Make sure you do this before disconnecting your current SIM card or you’ll be stuck with a new number.

Here are the customer service numbers for major UK providers:

EE: 150 from your EE handset or 07953 966250
O2: 202 from your O2 handset or 0344 8090202
Three: 333 from your Three handset or 0333 3381001
Vodafone: 191 from your Vodafone handset or 0333 3040191
Tesco Mobile: 4422 from your Tesco Mobile handset or 0800 0304422
Virgin Mobile: 789 from your Virgin Mobile handset or 0345 6000789
GiffGaff: 0843 9020762

How to keep your phone number in the US

Via text

In the US, the number porting process is overseen by the Federal Communications Commission (FCC), which guarantees your right to retain your phone number when switching carriers. Here’s what you need to do:

Ensure your number is eligible for porting. Most numbers can be transferred unless they are tied to certain prepaid plans or specific geographic restrictions.
Inform your new carrier that you want to port your number. They will request details such as your current account number, PIN or password for your account and billing address on file with your current provider.
Be sure to not cancel your old service before the porting process is complete, as this may result in losing your number.

In the US, the porting process can take a few minutes to a few days, depending on the type of number and provider. Mobile numbers typically transfer faster than landlines.

Prepaid customers may need to use up any remaining balance, as refunds are usually not issued. Your old service will be cancelled automatically once the porting is complete.

Via call

If you need assistance or prefer speaking to someone, you can contact your current US carrier directly as well. They will provide the necessary account details for porting.

Here are the customer service numbers for major US providers:

AT&T: 1-800-331-0500
Verizon: 1-800-922-0204
T-Mobile: 1-877-746-0909
Metro by T-Mobile: 1-888-863-8768
Sprint (now T-Mobile): 1-888-211-4727
Boost Mobile: 1-866-402-7366

How to get a new number instead

In the UK, if you want a new number, text “STAC” to 75075 to receive a Service Termination Authorisation Code. You’ll then receive a confirmation message from the provider, along with any relevant information about early-termination fees or outstanding balances.

This essentially terminates your contract, allowing you to move to a new supplier without ever talking to a customer service helpline.

In the US, however, there isn’t a centralised text service to obtain an authorisation code. Each provider has their own procedures, so you’ll need to contact them directly.

Will switching providers cost me?

Switching providers may incur costs if you’re still under contract or paying off a phone. Most contracts last 24 months, especially if a phone was included in the deal. If your contract is complete, there should be no early termination fees.

If you’re unsure about your contract status or remaining charges, contact your current provider. Many carriers also allow you to check your contract or device payoff status through their mobile apps or customer service.

If you’re unsure whether your contract has finished or not, Ofcom provides a free checking service in the UK. Text “INFO” to 85075 and you’ll be notified of the current status of your contract and any charges that might be due.

There you have it. A quick and easy way to switch between mobile providers. Of course, if you’re thinking of leaving then you’ll want to know what offers are around. So, be sure to read our roundups of the best phone networks and best phone deals.