giffgaff Free SIM Offer — Free SIM and plans from £6 a month

£8. That is the monthly price of the 40 GB giffgaff plan on an 18-month term, and the SIM is free. Plans run from pay as you go right up to unlimited data. giffgaff says there are no credit checks, and there is no handset tie-in to sign up for. The network runs on O2's 4G and 5G network.

What you get, in numbers

Plan	Data	Price
18-month plan	40 GB, made up of 6 GB and 34 GB added free	£8 a month
18-month plan	200 GB	£20 a month
18-month plan	Unlimited	£25 a month
Monthly rolling plan	2 GB	£6 a month
Monthly rolling plan	Unlimited	£35 a month
Pay as you go, one-month plan	1 GB	£6

Each figure comes from giffgaff's SIM only deals page, checked on 1 November 2026. The free SIM comes with every SIM-only plan, and the 18-month price lock covers plans bought before the end of 2026. On the 40 GB plan, the 34 GB on top of the 6 GB is free. The 2 GB rolling plan and the 1 GB pay as you go plan both start at £6.

Perks include unlimited UK calls and texts, plus tethering. Rolling and pay as you go plans get 5G at no extra cost, and up to 5 GB of your allowance works in the EU at no extra cost. On 18-month plans, you can change plan at any time.

How the reward lands

There is no code to enter. The offer is the plan prices on giffgaff's page, plus a free SIM. Open giffgaff through the TopReferrals link, then pick an 18-month, monthly rolling or pay as you go plan on the SIM only deals page. The page lists all three in one place. Order the free SIM, and you select your plan at activation. Moving from another network? Text PAC to 65075 to keep your number. giffgaff doesn't say how long delivery takes.

What a giffgaff SIM-only plan includes

giffgaff runs on O2's 4G and 5G network. Every plan includes unlimited UK calls and texts, plus tethering to share data with a laptop. 5G costs nothing extra on rolling and pay as you go plans.

You get a free SIM and choose your plan when you activate it. Your own handset stays yours, so there's nothing to pay off on a phone. Whichever plan you pick, you use the same O2 network.

Travelling in the EU? Up to 5 GB of your allowance works there at no extra cost. On an 18-month plan, you can change plan at any time. giffgaff's own page says "No credit checks" for its SIM-only plans.

Plans, prices and the price lock

The SIM only deals page lists three plan types, all priced per month:

• 18-month plans: £8 for 40 GB (6 GB plus 34 GB added free), £10 for 25 GB, £12 for 50 GB, £15 for 100 GB, £20 for 200 GB and £25 for unlimited data.
• Monthly rolling plans: £6 for 2 GB, £8 for 5 GB, £10 for 20 GB, £15 for 50 GB and £35 for unlimited data.
• Pay as you go: £6 for 1 GB on a one-month plan, £10 for 15 GB or £25 for 120 GB.

Sign up before the end of 2026 and your 18-month price is locked. The price lock follows giffgaff's fair usage rules, terms and exclusions.

Switching from another network? Text PAC to 65075 and keep the number you have.

Pick the size that fits your month and compare the prices side by side. Through the TopReferrals link, you open the SIM only deals page and order your free SIM. No code is needed: the prices on that page are the offer.

The fine print, in plain words

• Who qualifies: UK customers ordering a giffgaff SIM. giffgaff says no credit checks apply.
• 18-month plans: you can change plan at any time during the 18 months.
• Price lock: it covers 18-month plans ordered by the end of 2026, and follows fair usage rules and giffgaff's terms.
• Minimum spend: entry plans start at £6 a month, on a 2 GB rolling or 1 GB pay as you go plan.
• Expiry: no end date is stated for the offer on the page.
• Keeping your number: send PAC to 65075 by text before you switch.
• Not stated: giffgaff doesn't say how long the free SIM takes to arrive, or how refunds work.

Promo codes, coupons and vouchers

• "giffgaff promo code": No promo code is needed or listed. The offers are the plan prices on giffgaff's SIM only deals page.
• "giffgaff discount code": There is nothing to enter. The offer is the plan price itself, such as £8 a month for 40 GB on an 18-month plan.
• "giffgaff free sim": Order the free SIM through the TopReferrals link, then pick a plan when you switch it on.
• "giffgaff voucher code": No voucher is listed. The deal is the free SIM plus the plan prices.

Who gets the most out of it

• Teenagers and first-time phone owners: a monthly rolling plan with no handset tie-in, from £6 a month for 2 GB.
• Heavy data users: 200 GB for £20 a month, or unlimited data for £25, on 18-month plans.
• People switching networks: text PAC to 65075 to keep your number.
• Pay as you go fans: 15 GB for £10 on a one-month plan.

How TopReferrals checked this

TopReferrals read giffgaff's own pages on 1 November 2026. The SIM only deals page on giffgaff.com gave every plan price shown here, from £6 a month for a rolling 2 GB plan up to £25 for unlimited data on an 18-month contract. The same page listed the free SIM and the price lock on 18-month plans bought before the end of 2026. The same page also lists unlimited UK calls and texts, tethering and 5G at no extra cost on rolling and pay as you go plans.

The giffgaff homepage on giffgaff.com confirmed the O2 network and the EU allowance wording. Fair usage rules and the price lock exclusions sit in giffgaff's terms page, which TopReferrals also read. Each figure on this page was matched against the giffgaff page it came from.

TopReferrals found no promo code on those pages, so none is needed to get the offers. giffgaff doesn't say when the free SIM offer ends.

TopReferrals re-checks this offer on the date shown at the top of the page.