Customer complaints code.


Making a complaint.

At Three we do our best to provide you with a great service, so if you think we haven't done a good job we're keen to hear from you.


Our complaints process gives you the opportunity to tell us what's gone wrong so we can put it right and provide better service in the future. You can contact our complaints team using any of the methods on the right hand side of this page.


We aim to resolve your complaint as soon as possible and will keep you updated on when and how we propose to resolve it. We do our best to resolve all complaints within 14 days.


We’ve made every effort to make the complaints process as easy as possible. Here are a few things to keep in mind:


If you raise your complaint using the online form, you’ll receive an instant automatic reply with a complaint reference number so it’s easy to track.


We are happy for someone else to raise a complaint on your behalf as long as we have confirmation that they are acting with your consent.


We’ll do everything we can to sort out your complaint. However, if we haven’t been able to resolve it, you can ask the Ombudsman* to look at it for free.


If we are unable to reach agreement within 8 weeks we will provide details of how to contact the Ombudsman.


*The Ombudsman is an independent organisation dedicated to sorting out disputes between customers and providers and Three will be bound by its decision if a case is opened.


The Ombudsman will only consider complaints which are over 8 weeks old or if there is a deadlock situation. A deadlock arises when we believe we've done everything we can to sort out a complaint but can't reach an agreement with you.


You can request a deadlock letter from the advisor dealing with your complaint. However, if we are working on a solution, expect to resolve the complaint or recognise that your complaint fails outside the Ombudsman’s responsibilities we will not send a deadlock letter. Unfortunately on occasion we receive malicious complaints, which neither the Ombudsman nor Three will respond to.

Ombudsman contact details:


Ombudsman Services:
PO Box 730



If your complaint is about a purchase you made online and we’ve been unable to resolve your concerns through our complaints process, you can submit your complaint through the European Commission’s online dispute resolution platform, instead of contacting the Ombudsman directly. You can find the platform and more information on how it works here:

The platform simply facilitates the investigation and resolution of your complaint through the Ombudsman so, if you’re unhappy, you may find it easier to contact the Ombudsman directly. Remember, you can only use the platform if your complaint comes from an online transaction. If you made your purchase over the phone or in store, you need to contact the Ombudsman using the contact details above.


Fax: 0330 440 1615
Phone: 0330 440 1614
Textphone:   0330 440 1600
Ombudsman Logo

Contact Us.

Personal customer.


Fill out the online complaints form.                               

Call us.


0333 338 1001 from any other phone* 


Write to us.
Three Customer Complaints
Hutchison 3G UK Ltd.
PO Box 333
G2 9AG


Business customer.

A small business is one that spends less than £5,000 per year with Three or one that employs 10 people or fewer.

Fill out the online complaints form.

Call us.
337 free from a Three phone.
0333 338 1004 from any other phone.*

Write to us.
Three Business Services
PO Box 333
G2 9AG



Find out more information about our Accessibility Services.




*standard call charges apply

** Free, unless you’re on one of our new Essential Plans, in which case it will come out of any available minutes allowance or charged at your out of allowance rate of 35p per minute.