Activating your giffgaff SIM

Just pop over to Activate my SIM and we'll get that swiftly switched on for you. Simple.

Note: It can take up to 24 hours for your SIM to activate but it's usually much quicker. To check this, try switching your phone OFF/ON at different times throughout the day.

Lost activation code?

No problem. There’s a 13 digit code on the SIM itself that you can use instead:

I can’t activate my SIM

There’s a few reasons that might be causing problems for you. Keep in mind that in some situations it can take up to 24 hours.

If you’re a new member

Activating your SIM for the first time and running into any issues? Here are some handy steps to try out:

Check you’ve got the activation code right. It’s easy to misread it or type in the wrong thing
If the activation code isn’t working, or you cannot see it properly, you can activate the SIM using the ‘SIM serial number’ (SSN) located on the back of the SIM
Check for any service/network issues in your area by using your post code.
Perhaps there’s a glitch between the browser and website. Clear the browser ‘Cookies and Cache’ and try activating the SIM again
If that doesn’t resolve the issue, try using a different browser. Also trying with a different device can help

Note: If you're trying to activate your SIM using the app, give toggling ‘Flight mode’ ‘ON’ and then ‘OFF’ a go. Still having trouble? Try turning your device ‘OFF’ and then back ‘ON’.

If you’re already a giffgaff member

Already member and having issues trying to activate a new SIM? Here are some useful tips:

If you reported your original SIM as ‘Lost/Stolen’ and are now trying to activate a replacement SIM sent by giffgaff, just make sure to activate it on your original account, don’t activate it on a new one. The replacement SIM can only be activated there and is the only SIM that can be activated on the original account in this situation
Check you’ve got the activation code right. It can be easy to misread it or type the wrong thing
If you’re trying to activate a second SIM under your account it won’t work. It will just try to swap your number to the new SIM. You’ll need to create a separate account for each SIM
Make sure that if you’re trying to activate with a voucher, that the voucher has enough credit for the plan you’re trying to buy

If you're replacing a broken or non-working SIM

If your current SIM (physical or eSIM) has stopped working and you need to replace it with a new physical SIM, do not use the standard activate page. That page is for new members only. Instead, use the Replace my SIM path, which links the new SIM to your existing account, number, plan, and credit.

Importantly: this path does not require an SMS verification code. You just need to be logged into your giffgaff account.

Steps to activate a replacement SIM as an existing member

Get a new giffgaff SIM if you don't have one. Order one free at giffgaff.com/free-sim-cards, or pick one up for approx. £1 from a local supermarket or convenience store (Tesco, Sainsbury's, ASDA, Morrisons, Co-Op, Iceland, Home Bargains, B&M, Poundland, One Below, WH Smith, McColl's).
Log in to your giffgaff account first — before anything else. Use the giffgaff app, or go to giffgaff.com/profile/details. This is the step that links the SIM to your account without needing a code.
Once logged in, go to Replace my SIM. In the app: Account > SIM > Replace my SIM > Switch to a new physical SIM. On the web: Dashboard > Replace my SIM (or go directly to giffgaff.com/profile/details#simswap).
Enter the 13-digit activation code from the back of the new SIM card. This is the SSN/ICCID printed on the SIM itself. If you can't read it clearly, try the activation code printed on the SIM packaging instead.
Choose 'I'm registered with giffgaff' and sign in when prompted. Your number, plan, and credit transfer to the new SIM automatically. No SMS code is required.
Wait for the SIM to activate. This usually takes under an hour but can take up to 24 hours at busy times. Restart your phone or toggle flight mode on and off to prompt it to connect.

Note: If you're replacing a broken eSIM and plan to switch back to eSIM once this physical SIM is working, wait at least 24 hours after the physical SIM activates before switching back. eSIM switching is only available between 4:30am and 9:30pm.

Need a hand? Our community helpers know this topic inside out - ask them on our community.

FAQs

What's the difference between 'Activate my SIM' and 'Replace my SIM'?

These are two different paths for two different situations:

Activate my SIM (giffgaff.com/activate) — for new members setting up a giffgaff account for the first time. Creates a new account and assigns the SIM a new number.
Replace my SIM (via the app or giffgaff.com/profile/details) — for existing members swapping to a new SIM. Moves your existing number, plan, and credit to the new SIM. This is the correct path if you already have a giffgaff account.

If you activate via giffgaff.com/activate while already logged in, it will attempt a SIM swap (moving your number to the new SIM) rather than creating a new account -which may not be what you intended.

My SIM activated but I still have no signal, calls, or data

If your account shows the SIM is active but service still isn't working, try these steps:

Toggle flight mode on, wait 10 seconds, then off again. This forces your phone to search for a fresh network connection.
Restart your phone fully.
Check your default SIM settings. On a dual-SIM phone, go to Settings > Mobile Data (iPhone) or Settings > SIM cards and mobile networks (Android) and make sure the giffgaff SIM is set as the default for calls, texts, and data.
Check for network issues in your area at giffgaff.com/coverage-and-service.
If none of the above works and it has been less than 24 hours since activation, wait a little longer - some activations take the full 24 hours. If it has been over 24 hours with no service, contact us.

Can I set up a SIM PIN?

Setting a SIM PIN adds an extra layer of security to your mobile device, helping to keep your personal data safe. It ensures that even if someone gets hold of your SIM, they won’t be able to use it without the correct PIN. It's a simple step to take that can make a big difference in protecting your information.

Can I use a 4G SIM in a 5G-ready phone?

All of our giffgaff SIMs will work on 4G and 5G networks. So you can use any giffgaff SIM in your phone.

What’s my giffgaff number?

Once your SIM’s up and running, we’ll send you your giffgaff number. You’ll also find it in your dashboard or on the home screen in the app.

Or just text Number to 43430 – easy as pie.

Can I activate multiple SIMs onto the same account?

Unfortunately, NO. Members cannot activate multiple SIMs onto the same account. There can only be one SIM active on your giffgaff account at a time. You’ll need to create a separate account for each SIM.

You can activate multiple SIMs on new accounts using the same email address and payment details, so managing them is easy.

The giffgaff app allows you to manage multiple accounts so that you can easily switch between, and manage them in one place.

It's important to know that if you try to activate another SIM on an already active account, it performs a 'SIM swap', moving your number and plan/credit to the new SIM and deactivating the old one.

Note: When activating a new SIM, ensure you are logged out of any giffgaff account and then activate each new SIM on a new giffgaff account.