giffgaff SIM only offers: 40GB for £8, 80GB for £10
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We've checked through all the SIM only plans available on giffgaff this month to find which stack up best against the competition. Last updated: 21st October 2026.
giffgaff's best SIM only deals
The best value SIM only deal on giffgaff this month
just
£8
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 October on giffgaff, we'd say their best value deal is their discounted 18‑month SIM below, which gets you 40GB data, plus unlimited minutes and texts for £8 a month:
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. See lower-priced networks' deals here:
£10 for 80GB is giffgaff's next best SIM deal in October
just
£10
a month
✔ Unlimited mins and 80GB data See full deal
at giffgaff.com
(opens in new window)
For more monthly data, have a look at giffgaff's discounted 80GB SIM below at £10 a month, as it's another good deal. It's on a 18‑month plan and comes with 80GB data, unlimited minutes and texts:
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). Here are other networks you can beat it on:
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 get even more data, another option for you on giffgaff is their discounted 18‑month SIM below, which costs £15 a month for 100GB data and comes with unlimited minutes and texts:
It's a good enough deal to get into giffgaff's best SIMs but you can actually get a lower price for a similar plan elsewhere, even if you definitely want it to use the O2 network. See the networks with cheaper plans 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