Complete O2 Guide Updated January 2026

O2 Help & Support Centre

Your comprehensive guide to all O2 services. Find help with billing, roaming, upgrades, switching networks, and more. Expert guides for Pay Monthly, SIM Only, and O2 Refresh customers.

We've helped thousands of readers resolve their O2 issues, and here you'll find our most comprehensive guides to help you too.

Browse Help Topics

Billing & Payments

Manage your O2 bills and payment options

  • View bills
  • Payment methods
  • Direct debit

Roaming & International

Using your O2 phone abroad

  • EU roaming
  • International calls
  • Travel boosters

Signal & Coverage

Check coverage and fix signal issues

  • Coverage checker
  • Signal problems
  • WiFi Calling

Complaints & Escalation

Make a complaint and get it resolved

  • How to complain
  • Ombudsman
  • Compensation

Cancellation Guide

How to cancel your O2 contract

  • Leave O2
  • Early termination fees
  • 30-day notice

Price Increases

Understand O2 price rises and your options

  • Mid-contract rises
  • Your rights
  • How to leave

PAC Code & Switching

Switch networks and keep your number

  • Get PAC code
  • Keep your number
  • Switching guide

O2 Priority

Get exclusive O2 Priority rewards

  • Rewards
  • Concert tickets
  • Weekly offers

O2 Refresh

Understand O2 Refresh and upgrade early

  • Device Plan
  • Early upgrade
  • Pay off phone

eSIM Guide

Activate and manage your O2 eSIM

  • eSIM activation
  • Setup
  • Troubleshooting

Network Comparison

Compare UK mobile networks

  • O2 vs EE
  • O2 vs Vodafone
  • Best networks

Quick Contact Options

Get in touch with O2 through your preferred method

In our experience: Calling during off-peak hours (early morning before 9am or after 7pm) usually means shorter wait times. The My O2 app live chat is often the quickest option for simple queries.

Phone 202

202

Free from your O2 mobile

Mon-Fri 8am-9pm, Sat-Sun 8am-8pm

My O2 App

Download Free

Manage your account, check usage, pay bills, and chat with support

Available on iOS & Android

Live Chat

Chat Online

Get instant help through the My O2 app or o2.co.uk website

Mon-Fri 8am-9pm, Sat-Sun 8am-8pm

Frequently Asked Questions

Quick tip from our team: Before contacting O2, have your account number and recent bill to hand. Readers tell us this speeds up verification and gets you to a solution faster.

How do I contact O2 customer service?
You can contact O2 customer service by calling 202 from your O2 mobile (free) or 0344 809 0202 from any other phone. You can also use Live Chat through the My O2 app or website, available 8am-9pm Monday to Friday and 8am-8pm on weekends. For Pay As You Go customers, call 0800 032 1402 (free from any phone). O2 Business customers should call 0800 977 7337.
How do I check my O2 bill online?
Log into your My O2 account at o2.co.uk or use the My O2 app. Go to 'Bills' to view your current and previous bills, download PDF statements, and see a breakdown of all charges including calls, texts, and data usage. You can also text BILL to 21300 to receive a summary of your latest bill.
Can I use my O2 phone abroad?
Yes, O2 offers roaming in many countries. In the EU, O2 Europe Zone customers can use their UK allowance at no extra cost (subject to fair usage limits). For destinations outside Europe, you may need to add a Travel Booster or use pay-as-you-go roaming rates. Check your specific plan details in the My O2 app or contact O2 before travelling.
How do I upgrade my O2 phone?
Check your upgrade eligibility in the My O2 app or online at o2.co.uk. If you're on O2 Refresh, you can upgrade early by paying off your remaining Device Plan balance. You can upgrade online, through the My O2 app, by calling 0800 902 0217, or by visiting an O2 store. Early upgrades may require a new contract and could involve additional costs.
What is O2 Priority and how do I use it?
O2 Priority is a free rewards programme exclusively for O2 customers. It offers exclusive discounts, early access to concert and event tickets, and weekly treats from popular brands. Download the Priority app from the App Store or Google Play, sign in with your O2 account details, and browse available offers. You can also access Priority rewards through the My O2 app.

Sources & References

SM

Written by Sarah Mitchell

Mobile & Broadband Specialist

Sarah has over 8 years of experience helping UK consumers navigate mobile and broadband issues. Previously worked in telecommunications customer service and now writes guides to help others avoid common pitfalls.

Last reviewed: January 2026