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: 20th January 2026.
giffgaff's best SIM only deals
The SIM only deal on giffgaff we rate highest this month
just
£10
a month
✔ Unlimited mins and 20GB data See full deal
at giffgaff.com
(opens in new window)
At £10 a month for 20GB data along with unlimited minutes and texts, giffgaff's discounted 1‑month SIM only plan below is our best pick of all the deals they've got running in January:
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:
Or their £15 for 50GB SIM plan is worth a look too
just
£15
a month
✔ Unlimited mins and 50GB data See full deal
at giffgaff.com
(opens in new window)
If you think you'll need more data, we'd say this is one of giffgaff's best deals on SIM only this month too. It's a discounted 1‑month plan, comes with 50GB data, unlimited minutes and texts for £15 a month:
While it's good enough to be in our pick of giffgaff's best SIM only deals, other providers do still have similar plans for less, even ones that also use the O2 network. Here's where you can beat it on other networks:
giffgaff are also offering 100GB for £15 on SIM only
just
£15
a month
✔ Unlimited mins and 100GB data See full deal
at giffgaff.com
(opens in new window)
For those needing even more data, have a look at giffgaff's discounted 100GB SIM below at £15 a month, as it's another good deal. It's on a 18‑month plan and comes with 100GB data, unlimited minutes and texts:
It's definitely one of giffgaff's best. But it's not market-leading. You can get a similar plan on other providers for less, even if you need your SIM to use the O2 network. See lower-priced networks' deals 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