Cancel Three Mobile the easy way

Core service

Three Mobile is the consumer brand operated by Hutchison 3G UK Limited, providing pay monthly mobile plans, pay as you go services, device plans and Home Broadband in the United Kingdom.

Who it serves

Three targets individual mobile users and businesses across the UK with voice, text, data bundles and device financing options. As of 2026 Three reports 10.9 million subscribers and annual revenue of £2.59bn.

Company facts

Web / My3 / Three app

1. Open My3 at three.co.uk or the Three app and sign in.
2. Go to Manage your plan then Leave Three or Account > Help > Leave Three.
3. Follow the on-screen prompts to request a STAC or to give notice without moving your number.
4. You will receive a confirmation in-app and by email when the STAC is issued or the cancellation request is logged.

iOS / Android app

1. Open the Three app on your device and sign in with your account.
2. Navigate to Account > Help > Leave Three and choose the option to get a STAC or to cancel.
3. Copy the STAC code from the text or email; STAC is valid for 30 days.

Phone

1. Call Three Customer Services on 0333 338 1082.
2. Tell the agent you want to leave Three and whether you will keep your number (request STAC) or not.
3. Ask for a call reference and for the STAC to be sent to your phone or email.

Email / Web form

1. Three does not publish a general cancellation email address. Use the My3 portal, app, Live Chat or call for an official STAC or cancellation request.
2. If you send a postal cancellation, include your name, account number and signature.

Post (registered letter)

1. Write a letter addressed to Three Mobile, include your name, account number, address and signature.
2. Send it by registered mail to Three Mobile, 20 Grenfell Road, SL6 1EH Maidenhead, United Kingdom.
3. Keep proof of postage; termination will be processed with 30 days' notice.

Moving abroad (moving/deménagement)

If you permanently move abroad and Three cannot provide services at your new address you should contact Three and supply proof of new address such as a utility bill or proof of tenancy. The exact outcome depends on the contract; Three's terms must be checked via your account or customer services.

Applicable law: Consumer Rights Act 2015 for service performance and rights where service cannot be provided.

Price increase

If Three increases the price and the change gives you a right to terminate, you can give 30 days' notice to leave without an early termination fee provided you notify the network in the notice period. Keep a copy of the price change notice from Three as proof.

Applicable law: Consumer Rights Act 2015 and contract terms as sent by Three. See Three's published terms for price change rules.

Death of subscriber

In the event of the account holder's death, contact Three with the death certificate and proof of executorship. Three's support team will provide account closure steps. Keep postal or email confirmation.

Legitimate grounds accepted by Three

Three lists service changes or inability to provide services as grounds that may permit termination without charge. Evidence required depends on the reason and typically includes official notices or supporting documents. Specifics are in Three's terms.

End of minimum commitment

When your minimum contract term ends you can cancel without an early termination charge by giving 30 days' notice. If you cancel within the minimum term an early termination fee may apply equal to remaining monthly charges as per Three's terms.

Applicable law: Consumer Rights Act 2015 regarding unfair contract terms. Exact calculation follows Three's contract terms available in your account.

Cooling-off period

Under the Consumer Contracts Regulations 2013 you have a 14-day cooling-off period for contracts concluded online, by phone or away from premises if the service cost is £42 or more. Within 14 days you may cancel and receive a refund. If you asked the trader to start performance within the period, the trader can charge proportionally for the service supplied up to cancellation.

Applicable law: Consumer Contracts Regulations 2013; see Citizens Advice.

Before you cancel: negotiate

Three's published materials show pathways to request changes via Live Chat, My3 or phone. Three sometimes offers retention options when you contact Customer Services, but no fixed retention price list is published. If you want to keep your number and lower cost, ask a customer service agent for a retention or SIM-only offer when you call 0333 338 1082 or use Live Chat. If you have a Device Plan, ask for the remaining device balance and whether a one-off settlement is possible.

How to ask

Call 0333 338 1082 or start Live Chat and say you want to leave because of price. Request any available SIM-only offer or a reduction. Record the agent name and reference and request written confirmation of the offer.

What cancelling saves you - example calculation

Because Three does not publish a single standard plan price in the research dataset, calculate potential savings using an example. If your current plan costs £35 per month then yearly cost is 35 x 12 = £420 per year. By switching to a cheaper competitor plan at £15 per month you would save 35 - 15 = £20 per month which is 20 x 12 = £240 per year.

Concrete fees to remember while negotiating: device exchange charge if applicable £12.99, and a potential charge related to disabling Find My iPhone up to £200 if not completed when returning a device. These numbers are part of Three's returns and exchange policy.

Cheapest real alternative

Review competitors such as Tesco Mobile and EE for SIM-only deals and check their current offers. See Tesco and EE for product details: Tesco Mobile and EE. Compare monthly totals and contract lengths before switching.

Key UK consumer laws

The Consumer Rights Act 2015 requires services to be performed with reasonable care and skill and protects against unfair contract terms. The Consumer Contracts Regulations 2013 provide a 14-day cooling-off period for distance and off-premises contracts costing £42 or more.

Auto-renewal and unfair terms

The Competition and Markets Authority (CMA) has guidance against hard-to-cancel subscriptions and unclear auto-renewal terms. If you think Three uses unfair auto-renewal or makes cancellation difficult, raise the issue with Citizens Advice and the CMA guidance can support your complaint.

How to escalate a complaint

1. Complain to Three Customer Services and keep records of calls, chats and emails. 2. If unresolved, contact Citizens Advice for guidance: Citizens Advice. 3. Use Communications & Internet Services Adjudication Scheme (CISAS) for unresolved telecom disputes if applicable. For payments made by credit card, consider Section 75 or a chargeback via your card issuer if eligible.

Check final bill

Review your final bill for outstanding charges, early termination fees and pro rata amounts for calls, texts or data used during the notice period. Three will charge for services used before the contract end.

Device plan and outstanding balance

If you had a Device Plan on Three Your Way and you cancel your airtime plan, the outstanding balance on your device remains payable. You must pay the remaining device balance via continued monthly payments or a full bank transfer as per Three's terms.

Save important data

Back up contacts, photos and messages before your service ends. If you port your number to a new operator using a STAC, your number will move and your Three SIM will stop working on the port date.

Re-activation and switching back

If you wish to return to Three later, you can sign up again as a new customer. Check promotions and any new price guides at Three's price guide pages: Three price guides.

Follow this checklist to cancel with minimum friction and to protect your rights.

• Decide whether you are keeping your number. If yes, request a STAC by texting STAC and DDMMYY to 75075.
• Log into My3 and start the Leave Three flow; save confirmation screenshots.
• If calling, note the agent name, call reference and request written confirmation.
• If returning a device, remove activation locks and disable Find My iPhone to avoid a charge up to £200.
• Keep proof of postage for any registered letters to Three Mobile, 20 Grenfell Road, SL6 1EH Maidenhead.
• Check for any outstanding device balance and arrange settlement.
• Keep a copy of the final bill and check for charges for service used during the notice period.