giffgaff SIM only offers: Unlimited for £15, 25GB 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: 10th October 2025.
giffgaff's best SIM only deals
The best SIM only deal on giffgaff this month
just
£15
a month
✔ Unlimited mins and unlimited data See full deal
at giffgaff.com
(opens in new window)
We think the best value for money SIM only plan on giffgaff for October is their discounted unlimited data for £25 £15 deal. It's on a 18‑month plan and comes with unlimited minutes and texts too:
If you add up the £10 monthly discount, you’ll save £180 in total over the full 18 months on the deal.
You can get a lower-priced SIM with unlimited data elsewhere if you don't need it to use the O2 network. But if you do need that, it is the cheapest deal available. See who's offering it for less here:
Their £10 for 25GB plan is a decent deal for October
just
£10
a month
✔ Unlimited mins and 25GB data See full deal
at giffgaff.com
(opens in new window)
If you don't need that much data, you might like the discounted £10 SIM only deal running on giffgaff at the moment. It's a 18‑month plan, which comes with 25GB data, unlimited minutes and texts too:
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. Here's where you can beat it on other networks:
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 less monthly data, we'd say this is one of giffgaff's best deals on SIM only this month too. It's a discounted 18‑month plan, comes with 6GB data, 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:
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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