Best SIMs on giffgaff: 20GB for £10, 50GB for £15
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We look at how giffgaff compare on price this month against their competitors on SIM only and find their best offers. Last updated: 9th January 2026.
giffgaff's best SIM only deals
Our favourite SIM only deal this month on giffgaff
just
£10
a month
✔ Unlimited mins and 20GB data See full deal
at giffgaff.com
(opens in new window)
Out of all giffgaff's SIM only plans they've got running this January, our current best pick would be their discounted £10 one below. It's on a 1‑month deal, gets you 20GB data, plus unlimited minutes and texts as well:
This is good for giffgaff but it's not an unbeatable price. You can get similar SIM only plans for less with some other providers, even ones that also use the O2 network. See which networks that are cheaper here:
£15 for 50GB is giffgaff's next best SIM deal in January
just
£15
a month
✔ Unlimited mins and 50GB data See full deal
at giffgaff.com
(opens in new window)
If you're more data-hungry, giffgaff are also offering this discounted £15 SIM, which includes 50GB data, unlimited minutes and texts on a 1‑month plan. It's another of their best deals:
It's a good deal by giffgaff's standards but price-wise you can still beat this plan on other providers (even ones that still use the O2 network). Here's where else you can get a lower price:
There's also a nice 100GB for £15 plan with them this month
just
£15
a month
✔ Unlimited mins and 100GB data See full deal
at giffgaff.com
(opens in new window)
To satisfy even bigger data needs, you might like the discounted £15 SIM only deal running on giffgaff at the moment. It's a 18‑month plan, which comes with 100GB data, unlimited minutes and texts too:
If you're open to joining other networks than giffgaff, you can actually get a similar deal for less, even with providers whose SIMs also use the O2 network. See who's offering it for less here:
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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