O2 Customer Service Number: How to Contact O2

The quickest route to O2 customer service is 202 free from your O2 mobile (or 4445 if you're on Pay As You Go). Calling from another phone or a landline costs standard UK rates. Here are all the contact routes, opening times, and faster alternatives to the phone queue.

O2 phone numbers and opening times

O2's customer service lines are open Monday-Friday 8am-9pm, Saturday 8am-8pm and Sunday 8am-6pm. O2 Business lines close earlier: Mon-Fri 8am-8pm and weekends 9am-5pm.

Faster than the phone queue: other ways to reach O2

• My O2 app: manage your account, check bills, add Bolt Ons and use the built-in virtual assistant — it handles most common queries without a wait.
• O2 webchat: on o2.co.uk's contact page, click "Ask our Virtual Assistant" — it can escalate to a human agent when needed.
• O2 Community forum: community.o2.co.uk — O2 staff and experienced members answer questions, often faster than phone queues for non-urgent issues.
• O2 stores: face-to-face help for SIM swaps, device issues and account queries — book or walk in.
• Social: O2 responds to @O2 on X (Twitter) and Facebook Messenger, typically within hours.

How to make a complaint to O2

Start with the normal channels above and ask for your issue to be logged as a complaint — O2 publishes a complaints code of practice. If it's unresolved after 6 weeks (or you receive a deadlock letter sooner), communications complaints can be escalated free to CISAS. Complaints about financial products, such as device finance or insurance, use the Financial Ombudsman Service.

Thinking of leaving? Get your PAC code first

If you're calling to complain or cancel, don't close your account before moving your number — that loses it permanently. Instead, text PAC to 65075 free from your O2 mobile and you'll get a PAC code plus any early-exit charges by reply. Our O2 PAC code guide covers the whole process, and how to cancel an O2 contract explains the fees.

Paying too much? The cheaper O2 alternative

If your issue is cost rather than service, consider Giffgaff — it runs on the same O2 network (identical coverage) with rolling 30-day plans from around £6/month, no contract and no credit check. Customer service works differently — online "Ask an Agent" instead of phone — but many people prefer it once they adjust. See our Giffgaff customer service guide for how it works.