What is SIM Only?
SIM Only provides data, calls and texts without a bundled handset. You use your existing unlocked phone. Because there is no device financing, SIM Only is almost always significantly cheaper than Pay Monthly — typically £10–20/month less for the same data.
Contract lengths
- 30-day rolling (or giffgaff goodybag): cancel anytime with 30 days notice. Three's 30-day plans exempt from annual rises. Giffgaff goodybags: pause or cancel anytime with no exit fee.
- 12-month: balance of savings and flexibility.
- 24-month: lowest monthly cost but committed for 2 full years.
Annual price rises by network (2026)
- O2: £2.50/month each April
- Three: £1.80–£1.90/month April — 30-day rolling exempt
- EE: £2.50/month from March 2026
- Vodafone: £2.50/month each April
- Tesco Mobile (Clubcard): No rise — frozen
- Sky Mobile: RPI-linked — 30-day exit right
- Lebara: No rises pledged
- iD Mobile: No CPI/RPI rises on SIM Only
- Giffgaff: No rises on rolling goodybags
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