Complain to Three
UK mobile network operator
TelecomHow to complain
Three handles complaints through its official online form.
Common Three complaints
Know your exact situation?
Step-by-step guides for the most common Three disputes - the law that applies, deadlines, and a template letter for each.
Three ombudsman & regulator routes
Which ombudsman handles Three complaints?
CISAS. Once Three’s own complaints process is exhausted (after 6 weeks or a deadlock letter), you can take your complaint there for free. Go to the ombudsman. Read our CISAS guide.
Can you complain to Ofcom about Three?
Not for individual disputes: Ofcom sets the rules for the sector but does not resolve personal complaints or award compensation. Complain to Three directly first and keep written records, then escalate to CISAS if it stays unresolved after 6 weeks or you receive a deadlock or final-response letter. You can still report Three to Ofcom to flag systemic problems, but that will not get your own money back.
Laws that protect you
Consumer Rights Act 2015
Services must be performed with reasonable care and skill.
Ofcom General Conditions
Rules for contract changes, billing accuracy, and switching.
Communications Act 2003
Regulatory framework for electronic communications services.
Tips for Three complaints
- Document all service outages with dates and times
- Keep records of all billing statements
- You can exit contracts penalty-free if terms change significantly
- Ofcom has automatic compensation rules for some issues
- Use the Ombudsman Services after 8 weeks of deadlock
If Three doesn't respond
- 1
Customer Service
Allow 14 daysContact your provider’s customer service team
- 2
Formal Complaint
Submit a formal complaint: providers must log it and give you a reference number
- 3
Ombudsman Services
6 weeksFree escalation to your provider’s ombudsman after 6 weeks or deadlock
Visit website - 4
How to complain
Three handles complaints through its official online form.
Expected response time
42 days
Telecoms have 6 weeks to resolve your complaint before you can escalate to their ADR scheme, free
Ready to fight back?
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Frequently asked questions
Tools & guides for your Three complaint
Free calculators and explainers that strengthen the case you make to Three.
- Loyalty penalty calculatorCalculate how much you’re overpaying.
- Consumer rights checkerFind the laws that back you up.
- Am I entitled? Quick quiz60 seconds to know if you’ve got a case.
- Case strength quizCheck if your complaint has legs in 30 seconds.
- Broadband speed complaint generatorGenerate a complaint for slow or unreliable internet.
- Broadband speed compensation checkerNot getting the speed you pay for? Check your exit rights.
- Telecoms ombudsman: escalate after 6 weeks, not 8Ofcom cut the telecoms ADR wait from 8 weeks to 6 on 8 April 2026. When you can escalate a broadband or mobile complaint, to which ombudsman, and how to skip the wait.
- 0% VAT on electricity from 1 October: check your billVAT on household electricity drops to 0% from 1 October 2026, worth around £45 a year - fixed tariffs included. How to check your bill got it, and what to do if not.
- Klarna & Clearpay complaints: your new rights from 15 July 2026BNPL comes under FCA regulation on 15 July 2026: affordability checks, real support in hardship, and Financial Ombudsman escalation. What changes and how to use it.
- 6 ways to get your money back when a company refuses a refundA refusal isn’t the end. Six free routes to your money - Consumer Rights Act letters, chargeback, Section 75, ombudsmen, small claims - and when to use each.
Not sure what the law actually entitles you to? Start with our UK consumer rights guide - refunds, faulty goods, and how to enforce your rights under the Consumer Rights Act 2015.
Ready to get results?
Read your Three letter first, with the law that applies to it. No account until you want to keep the draft and track what they do next.
Free to draft • The letter is yours either way
Work at Three? Reply to complaints here.
Don't let Three ignore you
A letter that cites the law, sets a deadline, and says what happens when it passes.
Create my Three complaintDisclaimer: NoReply is an independent consumer advocacy platform. We are not affiliated with, endorsed by, or connected to Three or any of the companies listed on this site. Contact information is sourced from publicly available company websites. This page is for informational purposes only and does not constitute legal advice.
Last reviewed: by NoReply Editorial