SMARTY and sim guide
SMARTY is a Three-owned digital brand using Three infrastructure, with a separate account and plan journey.
SMARTY is SIM-focused. Verify device unlock status, allowance and renewal before moving a line.
The terms that matter are those attached to your own service. An independent information line cannot view the account or confirm an individual balance, eligibility or coverage outcome.
Questions worth writing down.
A SIM connects an eligible device to a mobile subscription. Separate the physical or digital format from the airtime agreement itself.
- Which document or provider page states the rule for this specific account?
- Does the handset, postcode, destination or start date change the answer?
- What happens after the current term or allowance ends?
Check unlocked status, allowance, term, activation and the account holder. A replacement SIM is an official provider action.
Use the verified route.
Check whether a change takes effect immediately or from the next renewal.
For a change to service, a replacement SIM, a complaint or cancellation, contact SMARTY through its own verified account or help channel. We can talk through general information without requesting credentials.
Call for free information020 3996 8779↗Check live information.
SMARTY official help ↗Ofcom consumer information ↗Reviewed 28 September 2026. Provider details can change. Verify the current terms before making a personal decision.