Switch from O2 to giffgaff
Keep your phone number when you switch from O2 to giffgaff. Here's how in 3 simple steps.
Switching from O2 to giffgaff keeps you on the exact same Telefónica network infrastructure, so your coverage and signal strength will remain identical. The main benefit of switching is giffgaff's flexible, no-contract goodybag model, which is often significantly cheaper than O2's standard plans. Because both networks share the same masts, this is one of the lowest-risk switches you can make.
Important Warning
Do NOT cancel your contract manually. If you cancel before transferring your number, you will lose it permanently. Your old contract will automatically cancel once the transfer completes.
Pre-Switch Checklist
- Back up your data: Contacts, voicemails, and saved messages won't transfer.
- Unlock your phone: Ensure it's not locked to your old network if you plan to keep using it.
- Check Early Termination Fees: Text INFO to 85075 to see if you'll incur charges for leaving early.
How to Switch from O2 to giffgaff
Get your PAC code from O2
Text PAC to 65075 from your O2 phone to receive your PAC code instantly by SMS. You can also call O2 on 202 from your O2 handset, call 0344 809 0202 from another phone, or log in at accounts.o2.co.uk to request it online. Your PAC code will be valid for 30 days.
Give your PAC to giffgaff
Order a free SIM from giffgaff.com — giffgaff is an online-only network so there are no stores or phone support lines. Once your SIM arrives, activate it on the giffgaff website. During activation, enter your O2 PAC code when prompted to keep your existing number. Choose a goodybag that suits your usage.
Wait 1 working day
Your number will transfer from O2 to giffgaff within 1 working day. You will receive an SMS confirming the switch is complete. Your O2 contract will be automatically cancelled at that point. Since both services use the same network, you should not experience any change in signal quality.
Transfer Cut-off Times: Submitting your PAC code before 5:30 PM usually means your number will transfer the next working day. Submitting it after 5:30 PM or on weekends/bank holidays will add an extra working day to the process.
Final Bill: You'll receive a final bill from O2 shortly after the transfer is complete. This covers your usage up to the date of the switch.
Things to Check Before Switching
Check whether you still have time remaining on your O2 contract, as early exit fees may apply. Note that giffgaff is an online-only operator with community-based support rather than traditional call centres, so make sure you are comfortable with that approach. Redeem any O2 Priority offers before your account closes, as giffgaff does not have an equivalent loyalty programme.
Same Network Coverage
Since giffgaff is an MVNO running entirely on the O2/Telefónica network, your coverage will be exactly the same as what you currently experience on O2. There is no change in signal, 4G availability, or 5G access. This makes it a risk-free switch from a coverage perspective.
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