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Giffgaff SIM only deals

Giffgaff offers flexible SIM only goodybags on 30-day rolling terms, 18-month plans and unlimited data options, all on the O2 network.

Which network does Giffgaff run on?

Giffgaff operates on O2's network, so you get O2's coverage and 5G in supported areas while benefiting from Giffgaff's flexible, no-contract pricing.

It's worth checking O2 coverage at your home and work postcodes before joining to be sure the signal suits you.

What's the difference between Giffgaff's goodybags and an 18-month plan?

Goodybags are rolling 30-day bundles with no commitment, while the 18-month plans fix your allowance and price for longer, often at a lower effective monthly cost.

Choose goodybags for flexibility, or an 18-month plan if you want certainty and a slightly cheaper rate over time.

Our top pick
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Unlimited speed

SIM Only Unlimited - 18 months

Data
Unlimited
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
18 months
Total cost: £252
Price
£14per month
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Unlimited speed

golden goodybag - 0 months

Data
Unlimited
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£20per month
Get deal

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Unlimited speed

Pay Monthly 200GB - 18 months

Data
200 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
18 months
Total cost: £360
Price
£20per month
Get deal
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Unlimited speed

goodybag 200GB - 0 months

Data
200 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£35per month
Get deal
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Unlimited speed

SIM Only 100GB - 18 months

Data
100 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
18 months
Total cost: £270
Price
£15per month
Get deal
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Unlimited speed

golden goodybag - 0 months

Data
100 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£20per month
Get deal
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Unlimited speed

goodybag 80GB - 0 months

Data
80 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£20per month
Get deal
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Unlimited speed

SIM Only 50GB - 18 months

Data
50 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
18 months
Total cost: £216
Price
£12per month
Get deal
logo
Unlimited speed

golden goodybag - 0 months

Data
50 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£15per month
Get deal
logo
Unlimited speed

goodybag 30GB - 0 months

Data
30 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£15per month
Get deal
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Unlimited speed

golden goodybag - 0 months

Data
26 GB
(Unlimited speed included)
Allowances
Unlimited minutes
Unlimited texts
Contract
No contract
Price
£12per month
Get deal

Showing 1 to 10 of 19 results

giffgaff runs on O2's network but operates quite differently from a traditional mobile provider, built around a community-driven support model and a goodybag system rather than a conventional fixed monthly contract. It's become one of the UK's most recognisable budget brands, appealing particularly to switchers who want flexibility without sacrificing network quality.

1. What makes giffgaff different

Rather than signing a contract, you buy a monthly goodybag covering your data, calls and texts, and can change or cancel it at any time without penalty. Support is largely community-driven, with experienced members helping answer questions on giffgaff's forum, supplemented by more traditional support channels.

2. giffgaff's contract options

Alongside its standard 30-day goodybag model, giffgaff also offers an 18-month option for those who want a longer, fixed-price commitment, and unlimited data plans for heavier users.

3. giffgaff and O2's network

Because giffgaff runs over O2's infrastructure, coverage should broadly match O2's own network. Check O2's coverage specifically for your area before switching.

4. Comparing giffgaff against other budget brands

giffgaff competes with a wide range of budget SIM-only brands, including Smarty and Voxi on Three's network, and Asda Mobile on Vodafone's. Compare the specific model — goodybag flexibility versus a more traditional contract — alongside price to find what suits you best.

5. Frequently asked questions

What is a giffgaff goodybag?
A monthly bundle of data, minutes and texts that you choose and pay for upfront, giving you flexibility to change your plan each month without a fixed contract.

Does giffgaff have traditional customer service?
Support is largely community-driven through its forum, supplemented by other support channels, which is a different model from a traditional call centre and worth being comfortable with before switching.

What network does giffgaff use?
giffgaff runs over O2's network, giving it access to the same underlying coverage as O2's own customers.

Is giffgaff cheaper than O2's own SIM-only plans?
Often yes, since giffgaff typically operates with lower overheads than O2's own-brand pricing, though it's worth comparing live rates directly.

6. Conclusion

giffgaff's goodybag model and community support set it apart from traditional SIM-only providers, offering genuine flexibility on O2's network. Compare its various options — standard, 18-month and unlimited data — against your own usage and appetite for commitment.