giffgaff Free SIM: £8 a Month for 40 GB
£8 a month buys 40 GB on an 18-month plan, the SIM costs nothing, and rolling plans from £6 suit shorter commitments. Here is the full price breakdown.
Key takeaways
- 40 GB for £8 a month on an 18-month plan, with the SIM free.
- Monthly rolling plans start at £6 for 2 GB and run month to month.
- No code needed: the listed plan prices are the offer.
- Switching? Text PAC to 65075 to keep your number.
Our pick here: giffgaff pays £6 a month, free SIM, verified against its own terms.
£8 a month buys 40 GB on an 18-month plan, and the SIM is free. That is the headline, and TopReferrals has worked through the whole giffgaff range so you can compare the numbers before you order.
The numbers, side by side
Cost per gigabyte shows the value fastest.
| Plan | Data | Monthly cost | Cost per GB |
|---|---|---|---|
| 18-month | 40 GB | £8 | £0.20 |
| 18-month | 200 GB | £20 | £0.10 |
| Monthly rolling | 50 GB | £15 | £0.30 |
| Monthly rolling | 2 GB | £6 | £3.00 |
The 40 GB figure is 6 GB plus 34 GB added free. Put the 18-month 40 GB plan next to the rolling 2 GB plan and the gap is clear: £2 more a month gets you 38 GB more data. On 50 GB, the 18-month plan costs £12 a month, while the rolling plan costs £15. Commit for the term and you keep £3 a month on the same allowance.
Who each plan suits
- Long-term heavy users: 200 GB for £20 a month, or unlimited data for £25, on an 18-month term. The lowest cost per gig in the table sits here.
- Flexible budgets: monthly rolling plans run month to month, starting at £6 for 2 GB.
- Light and occasional use: pay as you go starts at £6 for 1 GB on a one-month plan.
- Switchers: text PAC to 65075 and keep the number you already have.
What comes with a plan
Plans include unlimited UK calls and texts, plus tethering. Calls and texts stay unlimited across the UK, so the data allowance is the only number you need to watch. Rolling and pay as you go plans come with 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, so the term doesn't lock you into one size. The network runs on O2's 4G and 5G coverage.
Getting your free SIM
No code is needed. The prices on giffgaff's SIM only deals page are the offer. Start through the TopReferrals link at https://topreferrals.co.uk/go/giffgaff, order the free SIM, then select your plan as you activate it. giffgaff doesn't say how long delivery takes, so build a little slack into your switch date.
The small print
giffgaff says there are no credit checks. The 18-month price lock applies to plans bought within the window giffgaff sets, and it follows fair usage rules and giffgaff's terms. giffgaff doesn't state an end date for the offer, and it doesn't say how refunds work. Read the terms before you commit.
The verdict
For long-term data at a fixed monthly price, the numbers do the selling. £8 a month gets 40 GB, the SIM costs nothing, and giffgaff says there are no credit checks. Shorter commitments are covered by rolling plans from £6 a month. Get the full price list at https://topreferrals.co.uk/go/giffgaff and pick the size that fits your month.
To claim it, join through topreferrals.co.uk/go/giffgaff: no code needed, the reward is built into the link.
How it compares
| 18-month plan | Monthly rolling plan | |
|---|---|---|
| Entry price | 40 GB at £8 a month | 2 GB at £6 a month |
| Mid-range | 50 GB at £12 a month | 50 GB at £15 a month |
| Top data | 200 GB at £20 a month | Unlimited at £35 a month |
| Unlimited | Unlimited at £25 a month | Unlimited at £35 a month |
Frequently asked questions
Is there a giffgaff promo code or discount code?
No code is needed, and TopReferrals found none on giffgaff's pages. The plan prices are the offer, such as £8 a month for 40 GB on an 18-month plan. Start at the giffgaff link.
What do I get for £8 a month?
An 18-month plan at £8 a month gives 40 GB, made up of 6 GB plus 34 GB added free. Plans also include unlimited UK calls and texts, plus tethering.
Can I keep my number when I switch?
Yes, if you are moving from another network. Text PAC to 65075 to keep your number, then order your free SIM.
How do I claim the free SIM?
Open giffgaff through the TopReferrals link at topreferrals.co.uk/go/giffgaff, pick a plan on the SIM only deals page, and order the free SIM. Select your plan as you activate it. giffgaff doesn't say how long delivery takes.
Does giffgaff run credit checks?
giffgaff says there are no credit checks on its SIM-only plans. UK customers ordering a giffgaff SIM can get the free SIM and the plan prices shown on its deals page.
Claim the giffgaff reward
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Last checked 1 November 2026 by Bez, Editor-in-Chief. Figures verified against each brand's own terms. How we check.
