Best giffgaff SIM deals: Unlimited for £15, 25GB for £10
The retailers featured on this page may compensate us when our readers follow links to their websites and make a purchase. More
We've compared pricing on all of giffgaff's pay monthly SIM only to find which ones stack up best against the rest of the market. Last updated: 25th November 2025.
giffgaff's best SIM only deals
Our favourite SIM only deal this month on giffgaff
just
£15
a month
✔ Unlimited mins and unlimited data See full deal
at giffgaff.com
(opens in new window)
We think giffgaff's best value option on SIM only this November is their discounted £25 £15 a month plan below, which comes with unlimited data, plus unlimited minutes and texts on a 18‑month deal:
That’s £180 you’ll save over 18 months with the deal thanks to the £10 monthly discount.
You can beat it for price if you don't need your SIM to be with a provider using the O2 network. But if that's a must, then it is the lowest-cost SIM with unlimited data. See lower-priced networks' deals here:
Their £10 for 25GB plan is a decent deal for November
just
£10
a month
✔ Unlimited mins and 25GB data See full deal
at giffgaff.com
(opens in new window)
If you don't want so much data, giffgaff are also offering this discounted £10 SIM, which includes 25GB data, unlimited minutes and texts on a 18‑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). Here are other networks you can beat it on:
They're also offering 6GB for £8 on SIM only currently
just
£8
a month
✔ Unlimited mins and 6GB data See full deal
at giffgaff.com
(opens in new window)
For people who don't need that much data, you might like the discounted £8 SIM only deal running on giffgaff at the moment. It's a 18‑month plan, which comes with 6GB data, unlimited minutes and texts too:
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:
Compare all SIM only plans
Compare deals from all networks
How giffgaff's deals compare with other networks
Networks
Providers:
Plan
Data: (0MB+)
Minutes: (0+)
Thanks, we'll send that out now. Please check your inbox for our email.More about giffgaff's SIM only plans
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