Is environmental reporting compliant with ESG frameworks?
Our reports align with commonly used sustainability metrics and provide audit-ready data to support internal or external ESG reporting.
Every physical SIM and eSIM in your estate is monitored individually, capturing:
- Actual data usage (GB consumed, not allocated)
- Real voice minutes (local and non-international calls)
- SMS volume (messages actually sent)
- SIM type (physical vs. eSIM – they have different carbon footprints)
Your SIMs operate on mixed 4G/5G UK networks. We apply the following verified emission factors:
Impact source | Emission factor | Verification / sources |
Mobile data usage | 0.05 kg CO₂e/GB | CE Delft, GSMA Intelligence |
Voice calls | 0.01 kg CO₂e/min | O2, GSMA updated efficiency analysis |
SMS messages | 0.000012 kg CO₂e/message | Vodafone lifecycle assessments |
Network infrastructure | 0.52 kg CO₂e/month per SIM | GSMA Intelligence, Omdia (UK grid mix) |
Physical SIM hardware | 0.005 kg CO₂e/month | Fraunhofer IZM, G+D lifecycle analysis |
eSIM software | 0.003 kg CO₂e/month | Fraunhofer IZM, G+D lifecycle analysis |
We use a dedicated formula to calculate emissions per SIM:
Per-SIM monthly CO₂e = (data_usage_GB × 0.05) + (voice_minutes × 0.01) + (sms_count × 0.000012) + 0.52 + sim_type_factor
Where sim_type_factor = 0.005 for physical SIMs, 0.003 for eSIMs
We then use this to calculate your monthly SIM estate impact:
Fleet CO₂e = Σ (CO₂e for each individual SIM)
Updated on: 05/03/2026
Thank you!