giffgaff is offering a huge 500GB of data for the first 6 months when you sign up to their £20 18-month contract1.

giffgaff’s 500GB for £20 offer has now ended. You’ll now get 120GB data for £20 when you sign up on giffgaff’s £20 SIM-only contract. This blog post is being kept as an archive for customers who signed up before the 1st February 2024.

In the UK, giffgaff has launched their new winter promotion, allowing you to get an extra 380GB of data per month for 6 months when you sign up to their £20 SIM-only contract. That’s 500GB instead of the usual 120GB of data. You’ll also get unlimited UK minutes and unlimited UK texts, with access to O2’s 4G & 5G network2.

In this article, we’ll look at giffgaff’s £20 winter promo offer, and how it gives you 500GB data for the first 6 months when you sign up on a £20 contract for 18 months. We’ll also look at the features included on the plan, and how you can keep your current phone number when you switch to giffgaff.

500GB Data for £20 on giffgaff

If you’re a heavy mobile user, it’s currently possible to get a massive 500GB of data per month for the first 6 months on giffgaff’s £20 contract plan (increased from 120GB). That’s an extra 380GB data per month for the first six months.

This special offer is available until the 1st February 2024. Alongside the 500GB data, you’ll get 4G & 5G coverage from O22. There’s also unlimited UK minutes and unlimited UK texts included on your plan:

TariffMinutesTextsDataMonthly Cost
£20 SIM Only ContractUnlimitedUnlimited500GB
for 6 months
was 120GB
18 months

You’ll need to sign up for an 18-month contract to get this deal, but you’ll retain the flexibility to change your plan over time (e.g. by moving to another plan in giffgaff’s 18-month range).

giffgaff Features

Change Your Plan Anytime

Although you’re signing up for an 18-month contract, you’ll retain the flexibility to change your plan from month to month4.

For instance, if things change and you need less data in the future, you can swap to another plan within giffgaff’s 18-month range. This is possible without resetting the term of your commitment or incurring early termination fees.

If required, it’s also possible to refresh your plan early (e.g. if you run out of data).

The following table shows the other plans available in giffgaff’s 18-month range:

TariffMinutesTextsDataMonthly Cost
£8 SIM Only ContractUnlimitedUnlimited6GB£8.00
£10 SIM Only ContractUnlimitedUnlimited25GB£10.00
£15 SIM Only ContractUnlimitedUnlimited40GB£15.00
£20 SIM Only ContractUnlimitedUnlimited500GB
for 6 months
was 120GB
£25 SIM Only ContractUnlimitedUnlimitedUnlimited£25.00

No Credit Check

There’s no need to go through a credit check when you sign up to a SIM-only contract from giffgaff. That means a lot less hassle: there’s no need to provide lots of obscure information such as your address history or to have a lengthy UK credit history when you sign up.

To get this deal, you can simply order your free SIM card online. When it arrives, you’ll be able to activate it, save a valid payment method, and set your plan to auto-renew monthly.

4G & 5G Coverage From O2

giffgaff is powered by the O2 network – you’ll get both 4G coverage and 5G coverage included as standard2.

Before you sign up as a new giffgaff member, it’s worth checking to make sure you can get coverage where you live. You can do this by entering your postcode on giffgaff’s online coverage map:

Check giffgaff coverage ( →

Inclusive EU Roaming

You’ll be able to use your plan allowance at no extra cost (up to 5GB per month) when you travel in the EU and selected destinations3.

This inclusive roaming covers many popular tourist destinations including Spain, Italy, France, Portugal and more. That means, for instance, you’ll be able to jet away for some sunshine this winter, without the need to pay more on your phone bill whilst you’re there (as long as you stay within the 5GB limit).

Fairer Exit Fees

You can change between giffgaff’s 18-month plans at any time, without resetting the term of your commitment or incurring early termination fees.

If you’re leaving giffgaff altogether, the early termination fee is just 50% of your current plan cost, multiplied by the number of months you have remaining on your contract (following the month in which cancellation is required). For instance, if you are on a £20 contract plan and you have 3 months remaining on your contract (following your current month), the early termination fee would be £30.

Certified B Corp

giffgaff is a certified B Corp with a score of 85.8. This score is based on five main areas: how they treat their customers, colleagues, the community, the environment, and how they run their business.

According to giffgaff, they’ve generated more than £1m worth of charitable donations together with their members. In addition, all of their SIM cards are made from recycled plastic, with fully recyclable packaging. giffgaff also offers a choice of refurbished mobile phones, allowing members to save money and to be more sustainable.

Keeping Your Phone Number

It’s easy keeping your current phone number when you switch to giffgaff.

Start by ordering your new SIM from the giffgaff website. Once you’ve done that, you can ask your current mobile network to give you a PAC Code. This is available through your mobile network’s website or app, or by texting PAC to 65075.

You can order your giffgaff SIM card by 5pm for next day delivery. Once you’ve activated it, you’ll be able to submit the PAC Code online through a form on giffgaff’s website. This will schedule the transfer of your phone number (normally for the next working day, as long you submit it before 3pm).

For a step-by-step guide on how to transfer your phone number to giffgaff, please select your current mobile network from the drop-down menu below:

PAC Code Finder: Transfer Your Phone Number to giffgaff

Select your current mobile network:

  More Options

More Information

For more information about the 500GB for £20 offer, please see giffgaff’s official website. You can also read our in-depth guide to contracts on giffgaff.

1 £20 Promo Terms: Offer ends 01/02/2024. Subject to availability. Get extra data for a 6 month period after which data allowance returns to 120GB. Terms apply. See

2 You need 5G coverage, a 5G device and 5G switched on in your giffgaff account. Find out more about 5G coverage at Terms apply, see

3 EU Roaming T&Cs: For all plans with over 5GB UK data, data roaming in EU and selected destinations is capped at 5GB. You’ll be charged 10p/MB once 5GB is used.

4 See for details on how to switch your plan mid-contract.

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