giffgaff sustainability score: 59/100
giffgaff is a UK mobile network operator that runs on the O2 network and is a wholly owned part of Virgin Media O2. Incorporated in 2001, it has its registered office in Reading.
More about giffgaff
It had about 299 staff and revenue of £633.8m in FY2025.
Founded 2001Head office Reading, UKStaff ~299 (FY2025 accounts average)Revenue £633.8m (FY2025)Website ↗
giffgaff reports Scope 3 as 99.9% of its emissions, mostly the O2 network and purchased goods. Its market-based total fell 9% in 2025 to 34,518 tCO2e, above its 2023 figure. It says it began a review of its SBTi targets in 2025 because the baseline predates its broadband service. Its figures carry no external assurance. It reports that 66% of the devices it sold in 2025 were refurbished.
giffgaff scores 59/100 (Making progress) on SINK's independent climate assessment, scored from public data only. Scores are free. Companies can never pay for anything about their own score. Last verified November 2026.
That places giffgaff joint 19th of 1,017 companies scored, and joint 2nd of 19 in Telecommunications.
What is giffgaff doing well, and where does it fall short?
Strongest on Controversies & Red Flags and Carbon Footprint: Operations (8/10, 7/10). Weakest on Nature & Biodiversity Impact and Water Impact (4/10, 4/10).
Where giffgaff lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
- Emissions from its own operations7/10Its own emissions aren't independently verified or tracked over several years.
- Emissions from its supply chain7/10No full value-chain map or supplier engagement programme.
- Whether its emissions are falling5/10No evidence of a year-on-year fall in its total emissions.
- How clean its energy is5/10Less than half its energy shown to be renewable, or no transition plan.
- Its effect on nature4/10Its effect on nature isn't measured or independently verified.
- How it uses materials and handles waste7/10No verified figures for reuse and recycling across the business.
- Its effect on water4/10No measured water footprint with reduction targets.
- Its climate targets7/10Its targets aren't validated by the Science Based Targets initiative.
- How openly it reports7/10No annual impact report, or no pay linked to climate targets.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is giffgaff's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleWhat evidence is giffgaff's score based on?
13 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
31% of them were published by giffgaff itself; the rest come from independent sources.
9 of 13 sources are independent of the company.
“emissions have been calculated in line with the GHG Protocol”
“Full accounts made up to 31 December 2024”
“In 2024 our emissions increased by 13% compared to 2023”
“We cut our greenhouse gas emissions by 9% compared to 2024”
“These tariffs do not fundamentally affect the emissions impact of the UK’s mobile network infrastructure.”
“running their offices with 91% renewable energy (from 2023)”
“In late 2023, giffgaff and MG OMD established the Up To Good Fund”
“made our SIM packaging from 100% FSC accredited MIX paper”
“an error in their billing system led to around 2.6 million customers”
“Ofcom fined Brit MVNO Giffgaff £1.4m today”
“Secured validation of our near-term and net zero emissions reduction targets”
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How does giffgaff compare with other telecommunications companies?
Where giffgaff sits among telecommunications peers.
Among the 19 major telecommunications brands we've scored, giffgaff is tied =2nd of 19, with 1 other.
Who scores higher in Telecommunications?
The one company in the sector scoring above giffgaff.
See the full Telecommunications table →Which companies moved this week, and why.
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