Compare giffgaff SIMs: Unlimited for £14, 20GB for £10
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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: 8th September 2026.
giffgaff's best SIM only deals
Our favourite current giffgaff SIM only deal
just
£14
a month
✔ Unlimited mins and unlimited data See full deal
at giffgaff.com
(opens in new window)
Out of all the SIM only plans available this September on giffgaff, we'd say their best value deal is their discounted 18‑month SIM below, which gets you unlimited data, plus unlimited minutes and texts for £25 £14 a month:
If you add up the £11 monthly discount, you’ll save £198 in total over the full 18 months on the deal.
This is actually the leading price in the UK at the moment for a SIM only deal with unlimited data. The plans under the dropdown are the next nearest you can get to giffgaff with other providers:
Their 20GB for £10 SIM is another good option
just
£10
a month
✔ Unlimited mins and 20GB data See full deal
at giffgaff.com
(opens in new window)
If you don't need that much data, our next best pick of giffgaff SIM only plans is their discounted 1‑month £10 deal below, which gets you 20GB data and unlimited minutes and texts:
Even though it's in our pick of giffgaff's best SIM only deals, you can actually beat it on price with other providers, including ones that also use the O2 network. Here's where you can beat it on other networks:
giffgaff's 50GB for £15 plan is a good option too
just
£15
a month
✔ Unlimited mins and 50GB data See full deal
at giffgaff.com
(opens in new window)
If you need more data, 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:
While this is a good enough deal to make it into the best of giffgaff's SIMs, you can beat it for price (even if you definitely want a provider that uses 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