Best giffgaff SIM deals: 40GB for £10, 75GB for £12
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We list the best of what's available on giffgaff's SIM only this month, after comparing each plan with other UK mobile networks. Last updated: 19th May 2026.
giffgaff's best SIM only deals
Our highest-rated SIM only deal on giffgaff this month
just
£10
a month
✔ Unlimited mins and 40GB data See full deal
at giffgaff.com
(opens in new window)
Out of all the SIM only plans available this May on giffgaff, we'd say their best value deal is their discounted 1‑month SIM below, which gets you 40GB data, plus unlimited minutes and texts for £10 a month:
In comparison to the rest of giffgaff's current SIM only plans, it's one of the best. But it is beatable on price, even if you're set on joining a provider that uses the O2 network. Here are the networks offering it cheaper:
They've also got a 75GB for £12 SIM plan at the moment
just
£12
a month
✔ Unlimited mins and 75GB data See full deal
at giffgaff.com
(opens in new window)
To get more data, another option for you on giffgaff is their discounted 1‑month SIM below, which costs £12 a month for 75GB data and comes with unlimited minutes and texts:
It does enough to get into our pick of giffgaff's best SIMs but that doesn't mean it's unbeatable on price. Other providers (even ones that use the O2 network) can beat it. See the networks that beat it here:
giffgaff's £15 for 150GB is our next best choice now
just
£15
a month
✔ Unlimited mins and 150GB data See full deal
at giffgaff.com
(opens in new window)
For people who need even more data, giffgaff have got a discounted £15 deal on SIM only we think's worth looking at. It gets you 150GB data, unlimited minutes and texts and it's a 1‑month plan:
Compared to giffgaff's other deals, this comes out among the best. But it's worth knowing you can get a lower price elsewhere, even on other providers that use the O2 network. Here are the networks where it'd cost less:
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How giffgaff’s benefits and SIM only prices stack up
In our full review of giffgaff we said we like that they offer full access to O2’s 5G/4G/3G/2G network at much lower costs than joining O2 directly. They also have a nice free WiFi hotspot scheme on top of that.
giffgaff market their SIM only deals (their “goodybags”) as monthly bundles of minutes, texts and data with no contracts. Compare their plans here to find the best possible deal.
Their best value plans are their mid-range data deals. For these they work out as one of the cheapest providers on the O2 network.
giffgaff still offer inclusive EU roaming on all plans at no extra cost. And you can get £5 free credit on your first £10 top up or bring a friend onto giffgaff to both get £5 free credit.
Useful link: Read our full giffgaff review
What else you should know about giffgaff’s SIM only plans
You’ll receive your SIM package within 2 working days. And you can even have it delivered in the EU within 3-5 days and beyond the EU around 5+ days after you order. giffgaff don’t offer eSIMs (these networks do).
If you’re not happy with your SIM you can return it to get a refund within 14 days. But you only get a refund on what you haven’t used, so you won’t get a full refund if you used some data (read more here).
Since you’re paying for your minutes, texts and data up front then you won’t have to pass a credit check for their SIM only plans. You’ll just have to give them some details so they know who you are.
If you want to switch to giffgaff from another network while keeping your old number you’ll have to request a PAC from your old provider to give to giffgaff. You can read their instructions on how this works here.
Useful link: Compare all giffgaff SIMs