Three contact number: How to get in touch
Miles Northrop | July 14th, 2026
When you need to get hold of your broadband provider, knowing the fastest way to reach an actual human being helps immensely. Three Broadband gives you several options, ranging from conventional phone support to live chat and (of course) social media. Because contact details can sometimes be tricky to track down, we’ve pulled together everything you need in one place. It's no so easy to find all this, so we've done the work for you!
How do I call Three Broadband's customer service?
If you're an existing Three Broadband customer and need technical help, or if you want to change or upgrade your package, the quickest route is to call their customer support teams directly. Simply dial 0333 338 1001 from any standard UK landline or non-Three mobile, or dial 333 for free if you're calling from a Three mobile handset. You will have to navigate through a menu to get to the right person though.
Calls to 0333 numbers are charged at standard UK rates and are usually included in your landline or mobile inclusive minute bundles. Standard customer service opening hours are 8am to 8pm Monday to Friday, and 9am to 6pm on weekends, with the sales teams being available a little later into the evenings.
| Service | Number | Hours |
|---|---|---|
| Three Broadband customer service | 0333 338 1001 | 08:00 to 20:00 Mon–Fri 09:00 to 18:00 Sat & Sun |
| Three Broadband support (from a Three phone) | 333 | 08:00 to 20:00 Mon–Fri 09:00 to 18:00 Sat & Sun |
| Three Broadband sales | 0333 338 1001 | 08:00 to 21:00 Mon–Sun |
| Three Broadband new customers | 0333 338 1001 | 08:00 to 21:00 Mon–Sun |
| Live Chat | Chat with support online | 08:00 to 22:00 Mon–Fri 09:00 to 20:00 Sat & Sun |
| X | @ThreeUKSupport | - |
| facebook.com/ThreeUK/ | - | |
| Three website support | three.co.uk/support | - |
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If you aren't yet a customer and want to speak to the sales department about switching to Three Broadband, you can call 0330 221 9424. Sales advisors are available from 8am to 8pm, seven days a week.
Three Broadband's postal address
If you need to send formal written correspondence, account documents, or a paper notice, send your letters directly to Three's customer support center:
Three Customer Services
Hutchison 3G UK Ltd
PO Box 333
Glasgow
G2 9AG
Three’s registered corporate headquarters is actually located at 450 Longwater Avenue, Green Park, Reading, RG2 6GF, but general account-related mail should be sent to the Glasgow PO Box above.
How do I contact Three Broadband customer service via Live Chat?
Three Broadband offers an online Live Chat service through its website and the My3 app, which is often the quickest way to get assistance without waiting in a call queue.
When you launch the chat, you will initially (and perhaps inevitably) interact with Three's virtual assistant. If the automated answers don't resolve your problem, simply request to speak with an advisor, and the system should queue you for an actual human customer service representative. Live Chat handles standard broadband technical support, billing queries, package upgrades and formal complaints.
Three Broadband on social media
Three’s digital support teams actively monitor their social media channels during waking hours. On X (formerly Twitter), you can reach their dedicated support account at @ThreeUKSupport. Posting a public message tagging them or sending a direct message often yields a fast response.
Three is also active on Facebook at facebook.com/ThreeUK/. While social media isn't a replacement for logging a formal technical fault, it can still be an excellent way to flag urgent issues or get a quick update on a open query.
How to complain to Three Broadband
If you feel the need to lodge a formal complaint, your first port of call is contacting their complaints team on 0333 338 1003 (or 333 free from a Three handset). Lines are open from 8am to 8pm Monday to Friday, and 9am to 6pm on weekends.
You can also raise complaints via Live Chat on the Three website or by filling in a form in the complaints section of the Three website.
Alternatively, you can submit a complaint digitally via Live Chat, fill out the webform in the complaints section of the official Three website or send an email detailing your issue to customercare@threebroadband.co.uk. Remember to always request a formal complaint reference number when you log your issue – this officially starts the clock for escalation. Three will aim to resolve formal complaints within five working days.
Finally, if you're not getting anywhere via any of these channels, consider using social media to escalate – posting @ThreeUKSupport or messaging via Facebook. This can speeds things up.
How to escalate your complaint
If Three fails to provide a satisfactory resolution, or if your logged complaint remains unresolved after eight weeks (or if Three issues you a formal "deadlock letter"), you can escalate your case to an independent regulator completely free of charge.
Three is a registered member of CISAS (the Communication & Internet Services Adjudication Scheme), run by CEDR (the Centre for Effective Dispute Resolution). CISAS is an Ofcom-approved, impartial adjudication service. We know, that's a lot of acronyms, but these organisations can prove very effective.
You can contact CISAS by phone on 020 7520 3814, email them at cisas@cedr.com, or file your case online at cisas.org.uk.
You'll need to provide your written log of interactions and your Three complaint reference number. If CISAS investigates and finds Three to be at fault, their decision is legally binding, obligating Three to carry out whatever financial compensation or action the adjudicator decides.
