giffgaff Unlimited Data Offer 2026: £14 Contract vs £20 Monthly Plan
giffgaff's limited-time unlimited data offer must go live by 11:59pm UK time on 2 October 2026. The £14 option is an 18-month contract, while the £20 option is a monthly rolling plan. They share the same headline allowance, but not the same commitment, post-promotion price or exit risk.
On this page
Choose by commitment first
| Situation | Better fit | Why |
|---|---|---|
| You will stay in the UK and need heavy data for 18 months | £14 18-month contract | Lower monthly price for the full term |
| Your plans may change | £20 Monthly Rolling | No 18-month commitment |
| You mainly roam or keep the number active | Neither by default | UK unlimited data may be unnecessary |
What each plan really costs
The £14 plan normally costs £25 and requires an 18-month commitment. At the promotional price, 18 months cost £252 instead of £450, a maximum saving of £198. It returns to £25 after the term, and leaving early may trigger an early termination charge.
The £20 Monthly Rolling plan normally costs £35. The discount lasts for 12 months while auto-renew remains enabled, then the price returns to £35. It costs more each month but is the safer choice when your UK stay is uncertain.
Unlimited still has boundaries
Unlimited data applies in the UK. EU and selected-destination roaming includes 5GB, after which the current charge is 10p per MB. Do not choose this plan for European roaming based on the word unlimited.
The Fair Usage Policy monitors unusually heavy use that harms the network, including regular tethering to 12 or more devices or roughly 650GB twice in six months. Possible action includes speed controls, extra charges, suspension or moving the account to another plan.
Three checks before buying
- 1
Confirm your UK stay
If 18 months is uncertain, flexibility may be worth more than the £6 monthly difference. - 2
Check real data use
Review the last three months. Users who consume 20GB to 50GB may save more on a fixed-data plan. - 3
Separate roaming needs
If European data matters, plan around the 5GB roaming allowance rather than the UK unlimited headline.
How new and existing members join
New members can use eSIM for faster setup. If the phone does not support eSIM, prepare an unactivated giffgaff physical SIM and activate it before buying the plan. LarkSIM supplies the physical SIM, not the £14 or £20 plan itself.
Existing members must opt in through the giffgaff app and set the offer as their future plan. Check the plan name, price and start date in the account instead of assuming an existing unlimited plan will be discounted automatically.
- 1
Check setup time
Make sure eSIM works on the phone or that a physical SIM can arrive before the deadline. - 2
Choose the commitment
Use £14 for a stable 18-month need, or £20 when flexibility matters. - 3
Save the receipt
Keep a screenshot showing the plan, price, benefit period and start date. - 4
Verify the first renewal
Return to the dashboard after activation and confirm the expected price.
The decision to take away
- check_circleChoose £14 only when you can use the plan for the full 18 months.
- check_circleChoose £20 when the freedom to leave is worth £6 a month.
- check_circleUse a smaller plan when unlimited data will mostly sit unused.
- check_circleActivate by 11:59pm on 2 October 2026 and retain proof of the price and start date.
- check_circleTreat EU roaming as 5GB, not unlimited.