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How-to · Step-by-step

How to switch mobile network (PAC or STAC)

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In short. Text PAC to 65075 to keep your number or STAC to 75075 to start fresh, give the code to your new provider, and switching completes within one working day — your old contract ends automatically with no need to call and cancel.

Ofcom's text-to-switch rules make changing mobile provider straightforward. You can keep your phone number with a PAC (Porting Authorisation Code) or start a new number with a STAC (Service Termination Authorisation Code). Switching typically completes within one working day. For help choosing between contract and SIM-only, see our comparison (/bills-utilities/mobile-sim-only-vs-contract/).

Last reviewed:

·Estimated time: 1 day

The steps

  1. 01

    Compare deals and choose your new provider

    Check coverage in your area using Ofcom's mobile coverage checker, compare data allowances, and factor in any handset costs. SIM-only deals are often cheaper if you already own a phone. Ensure the new provider supports your handset's network bands.

    Official link →

  2. 02

    Request your PAC or STAC by text

    To keep your number, text PAC to 65075 free from the number you want to keep. To cancel and get a new number, text STAC to 75075. You receive a reply within one minute with your code and any early termination charges. Codes expire after 30 days.

    Official link →

  3. 03

    Review any exit fees before proceeding

    Your PAC or STAC text reply shows outstanding contract charges. Early termination fees apply if you leave before your minimum term ends. Weigh these against savings from the new deal — sometimes waiting until the contract ends is cheaper.

  4. 04

    Give the code to your new provider

    When signing up, provide your PAC to transfer your number or your STAC to cancel the old service. The new provider handles the switch — you do not need to contact your old network to cancel if you use a PAC or STAC correctly.

    Official link →

  5. 05

    Choose your switch date

    Switching completes on the next working day if you submit before the cut-off (usually afternoon). You can request a later date. During the switch, you may have a short period where only one network works — plan around this if you rely on your phone.

  6. 06

    Insert the new SIM and test

    When the switch completes, insert your new SIM if you received one. Your number transfers automatically with a PAC. Make a test call, check data, and confirm voicemail works. Your old SIM stops working once the port completes.

  7. 07

    Check your final bill from the old provider

    Your old provider sends a final bill covering any outstanding charges and pro-rata fees. Verify early termination charges match what the PAC/STAC text stated. Dispute errors in writing if the amount differs.

Common pitfalls

  • Cancelling your old contract before porting completes loses your number — always use the PAC process rather than calling to cancel first
  • Ignoring early termination fees shown in the PAC text — switching mid-contract can cost more than staying until the term ends
  • Forgetting that PAC and STAC codes expire after 30 days — request a fresh code if yours runs out before you complete the switch

FAQ

Can I switch if I owe money to my current provider?
Yes. The PAC or STAC text still works, but you remain liable for outstanding balances. Your old provider sends a final bill after the switch.
Will I lose service during the switch?
There may be a brief window — usually up to a few hours on switch day — where service drops on one network before activating on the other. Switching on a working day minimises disruption.
Can I switch a landline or broadband the same way?
Mobile switching uses PAC/STAC texts. Broadband switching follows a separate One Touch Switch process — see Ofcom's guidance on switching broadband and landline together.
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