SIM only · Monthly rolling
giffgaff
A SIM-only brand with monthly “goodybags” and no long contract, running on O2.
- Uses network
- O2
- Contracts
- Mainly 30-day rolling
- Owner
- Virgin Media O2
- Type
- MVNO
30-day rolling vs 12-month plans
30-day plans let you leave or change with a month’s notice: great for flexibility and for trying a network. 12-month plans can be cheaper per month but tie you in, and some include price rises during the term. Always read the contract summary.
How much data do you need?
- Light: messaging, maps and email, mostly on wi-fi. A small allowance is often enough.
- Medium: social media, music streaming and some video away from wi-fi.
- Heavy: video streaming, hotspotting a laptop or working on the go. Consider a large or unlimited plan.
Check your phone’s settings for your average monthly use over the last few months. That’s your best guide.
Extras worth checking
- EU roaming: many plans now charge daily fees abroad. See our roaming guide.
- 5G and speed caps: some cheap plans cap speeds or exclude 5G.
- Wi-fi calling and eSIM: useful if indoor signal is weak, or for dual-SIM phones.
- Data rollover: some brands let unused data carry over.
Last updated: 14 October 2026
