Three
Mobile service and home data

Start with the service

Three’s help pages distinguish phone plans, SIM-only service, Pay As You Go and mobile broadband. Begin by identifying which of these describes the line or router you actually use.

SIM and payment rhythm

Three’s current PAYG guidance includes digital SIM and physical SIM paths. A pack allowance is not the same thing as spare top-up credit. Check renewal, validity and the activity needed to retain the number.

Write down the allowance refresh date, minimum commitment, renewal control and permitted use. These details answer different questions. A plan can renew monthly while still carrying a longer minimum term, and a digital SIM can carry the same airtime conditions as a plastic SIM.

The phone arrangement

For a handset arrangement, record the device obligation as well as the airtime term. A number transfer or a change to airtime does not necessarily remove a separate device responsibility.

Ask when the current commitment ends, what remains if you move the number, and whether a handset change creates another term. Save the answer with the agreement rather than treating a promotional description as the contract.

Digital SIM preparation

Three documents eSIM installation and device compatibility. Decide whether you are activating a new line, converting an existing SIM or transferring to another phone: the instructions are not interchangeable.

Prepare a reliable connection and keep the old working line available until the replacement has been tested. Never send someone else an activation QR code, password or one-time verification code. A SIM change does not transfer photos or other personal files.

Broadband and shared data

A Three home router uses mobile reception. Position it away from heavy obstructions, compare more than one room and test at the times the household normally connects. A phone’s outdoor signal is only a clue to indoor router performance.

Use outside the UK

Go Roam rules differ between account types and plan families. Check the destination, any access condition and the allowance that applies abroad; domestic unlimited data should not be read as unlimited roaming.

Postcode and signal evidence

For Three, begin with the current provider checker for the full postcode and compare Ofcom’s Map Your Mobile. Note whether the result describes indoors or outdoors. A map is a prediction, not a measurement from your room. Test voice, SMS and data separately; an issue with one does not prove all three are unavailable.

If the issue began suddenly, check the status page before changing settings. If it appears only in one building, compare near a window and outdoors. If several nearby users have the same symptom, keep a record of the location and time for the provider.

Keeping a number and leaving

An individual Three account change belongs with the provider. If keeping one UK mobile number, Ofcom’s text-to-switch route uses PAC to 65075; STAC to 75075 is the route when that number is not retained. A code is valid for 30 days. Before submitting it to the destination provider, check any minimum term or separate device balance. For cancellation without a switch, request the provider’s own instructions.

Annual notices and account tools

Read the adjustment wording in the actual Three agreement and keep the dated notice. Ofcom’s rules from 17 January 2025 require specified in-contract increases on new contracts to be stated in pounds and pence with clear timing. We do not list plan amounts or predict an individual bill. Use the verified provider account or app, where available, for personal records; mestemwell has no access to it.

When a statement looks unfamiliar, identify the service period, device component, recurring airtime and any exceptional use separately. Ask the provider about disputed items through its formal route and retain the response. Do not share the statement or payment information on this website.