Best giffgaff SIM deals: 40GB for £10, 75GB for £12
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Have a look at the plans on giffgaff's SIM only that we rate best this month. We've compared prices against every other network. Last updated: 7th April 2026.
giffgaff's best SIM only deals
This month's overall best giffgaff SIM only deal
just
£10
a month
✔ Unlimited mins and 40GB data See full deal
at giffgaff.com
(opens in new window)
We'd say the best SIM only plan giffgaff are selling this April is their discounted 1‑month 40GB deal below, which comes in at £10 a month and includes 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 are other networks you can beat it on:
giffgaff's £12 for 75GB is our next best choice now
just
£12
a month
✔ Unlimited mins and 75GB data See full deal
at giffgaff.com
(opens in new window)
If you want more data, giffgaff are also offering this discounted £12 SIM, which includes 75GB data, unlimited minutes and texts on a 1‑month plan. It's another of their best deals:
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 the networks with cheaper plans here:
Their £15 SIM with 150GB is our next favourite this April
just
£15
a month
✔ Unlimited mins and 150GB data See full deal
at giffgaff.com
(opens in new window)
For even more data, you might like the discounted £15 SIM only deal running on giffgaff at the moment. It's a 1‑month plan, which comes with 150GB data, unlimited minutes and texts too:
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's which other networks can beat it:
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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