The quickest route to Three customer service is 333 from your Three mobile — free on current plans. Three's live chat stays open later than its phone lines, which often makes it the faster option in the evening. Here are all the contact routes and opening times.
The short answer
Call 333 from your Three mobile (free on current plans) or 0333 338 1001 from any other phone. Phone lines: Mon-Fri 8am-8pm, weekends 9am-6pm. Live chat runs later: Mon-Fri 8am-10pm, weekends 9am-8pm.
Three phone numbers and opening times
| Calling from | Number | Cost |
|---|---|---|
| Your Three mobile | 333 | Free on current plans |
| Landline / other phone | 0333 338 1001 | Standard UK rate |
| From abroad | +44 7782 333 333 | Standard roaming rates |
Three's phone lines for personal customers are open Monday-Friday 8am-8pm and weekends 9am-6pm. Live chat is available longer: Mon-Fri 8am-10pm, Sat-Sun 9am-8pm — it's often the fastest evening option.
Faster than the phone queue: other ways to reach Three
- Live chat: on three.co.uk's contact page — open later than the phone lines and usually the quickest evening option.
- Three app: check bills, allowances, upgrade eligibility and manage add-ons without calling.
- Three Community: forum.three.co.uk — staff and members answer common questions.
- Three stores: high-street locations for SIM swaps, device issues and account help.
- Social: Three responds on X (Twitter) and Facebook during opening hours.
How to make a complaint to Three
Call 333 or use live chat and ask for the issue to be logged as a complaint — Three publishes a complaints code of practice. If unresolved after 6 weeks or you receive a deadlock letter, escalate free to Communications Ombudsman.
Thinking of leaving? Get your PAC code first
Don't cancel before moving your number — you'll lose it permanently. Text PAC to 65075 free from your Three mobile for your code plus any early-exit charges. Our Three PAC code guide covers the process and how to cancel a Three contract explains the fees.
Cheaper alternatives if you're leaving
If you want to stay on Three's network for less, Smarty and iD Mobile run on it with cheaper rolling plans. Otherwise: Giffgaff (O2 network, from ~£6/month) and Lebara (Vodafone network, from ~£5/month, international minutes included) are both contract-free — and since Three merged with Vodafone, Lebara's network now shares infrastructure with Three's. Compare with our Three coverage checker.
Test a cheaper network free
Free SIM, no contract — check the signal, keep it if it's good.