Mobile · Provider guide
giffgaff SIM-only deals: every plan and the real cost
giffgaff has 8 deals in our table on 25 Oct 2026, from £8.00 a month. The best value is 5GB monthly rolling at a real cost of £8.00 a month (5GB data · O2 network · No contract). Its deal page gives no price rise in pounds, so read its price terms before you sign.
Best-value giffgaff planAffiliate
giffgaff 5GB monthly rolling
5GB data · O2 network · No contract · £8.00 a month real cost
The lowest real cost here from a national provider on 25 Oct 2026, with fees and stated price rises counted.
Every giffgaff deal we track
Checked 25 Oct 2026| Provider and package | Data | Contract | Monthly price | Real cost | Deal |
|---|---|---|---|---|---|
giffgaff 5GB monthly rolling No credit checks | Data5GBO2 network · 5G | ContractNo contractEU roaming included | Monthly price£8.00Price may change | Real cost£8.00 /mo£96.00 over 12 months | See deal at giffgaff (opens in a new tab) |
giffgaff 80GB 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | Data80GBO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£10.00Price locked | Real cost£10.00 /mo£180.00 over 18 months | See deal at giffgaff (opens in a new tab) |
giffgaff 20GB monthly rolling No credit checks | Data20GBO2 network · 5G | ContractNo contractEU roaming included | Monthly price£10.00Price may change | Real cost£10.00 /mo£120.00 over 12 months | See deal at giffgaff (opens in a new tab) |
giffgaff 50GB 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | Data50GBO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£12.00Price locked | Real cost£12.00 /mo£216.00 over 18 months | See deal at giffgaff (opens in a new tab) |
giffgaff 100GB 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | Data100GBO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£15.00Price locked | Real cost£15.00 /mo£270.00 over 18 months | See deal at giffgaff (opens in a new tab) |
giffgaff 100GB monthly rolling No credit checks | Data100GBO2 network · 5G | ContractNo contractEU roaming included | Monthly price£20.00Price may change | Real cost£20.00 /mo£240.00 over 12 months | See deal at giffgaff (opens in a new tab) |
giffgaff Unlimited 18 month plan No credit checks · No mid-contract price rises on 18 month contracts bought before the end of 2026 | DataUnlimitedO2 network · 5G | Contract18 monthsEU roaming included | Monthly price£25.00Price locked | Real cost£25.00 /mo£450.00 over 18 months | See deal at giffgaff (opens in a new tab) |
giffgaff Unlimited monthly rolling No credit checks | DataUnlimitedO2 network · 5G | ContractNo contractEU roaming included | Monthly price£35.00Price may change | Real cost£35.00 /mo£420.00 over 12 months | See deal at giffgaff (opens in a new tab) |
AffiliateRanked by real cost; commission never changes the order. How we make money. Prices checked on each provider's own site on 25 Oct 2026.
Who giffgaff suits
giffgaff suits people who want flexible SIM-only data on the O2 network. Its 8 plans in our table run from 5GB to unlimited data, so most users will find a fit.
Pick a 30-day rolling plan if you want to leave with a month's notice or less. Choose an 18-month plan if you want a steady price. Contracts on 18-month plans bought before the end of 2026 have no mid-contract price rises.
giffgaff also suits people with no credit history, as it does no credit checks. If you travel in Europe, EU roaming is included on its plans in our table. giffgaff also lists unlimited UK calls and texts.
It may not suit you if you want a network other than O2, because giffgaff runs only on O2. Sort the table by real cost to compare it with other SIM-only deals.
Network and coverage
giffgaff uses the O2 network, so its coverage matches O2's. A host network is the mobile network whose masts carry your calls and data. Every UK SIM-only brand runs on one of four networks: EE, O2, Vodafone or Three. Brands on the same network share its coverage.
giffgaff is community-run and owned by Virgin Media O2, which runs O2. All giffgaff plans in our table include 5G, so you can use it where your area has 5G on O2.
If O2 signal is weak where you live, compare EE SIM-only deals first. EE runs its own network, so its coverage differs.
What it really costs
giffgaff offers 30-day rolling plans and 18-month contracts. Sort the table by real cost to find the cheapest option for you.
Our real cost adds up everything you pay over the contract, including each monthly price, any stated price rise and any setup fee. It then divides that total by the number of months.
giffgaff says its 18-month contracts bought before the end of 2026 have no mid-contract price rises. Any price rise in a new contract must be stated in pounds and pence when you sign up. Percentage and inflation-linked rises are banned in new contracts.
The 30-day plans have no tie-in. You can leave with a month's notice or less. Extras include unlimited UK calls and texts, no credit checks. Check the date on the table to see when prices were last checked.
Straight answers
Questions people ask
- Is giffgaff good value?
- Yes, giffgaff can be good value, especially if you want O2 coverage with no credit checks. Its plans include 5G and EU roaming, and you can choose 30-day rolling or 18-month terms. Our table ranks each plan by real cost, meaning everything you pay over the contract, averaged per month.
- What network does giffgaff use?
- giffgaff uses the O2 network. It is a community-run brand owned by Virgin Media O2, so its SIM-only plans share O2's coverage. Every UK SIM-only brand runs on one of four networks: EE, O2, Vodafone or Three. giffgaff plans also include 5G.
- How do I switch to giffgaff and keep my number?
- Text PAC to 65075 to get your PAC code, then give that code to giffgaff. Your number moves across in one working day, so you keep the same number. If you would rather leave without keeping your number, text STAC to 75075 instead.