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How to Check Your O2 Balance in the UK: 2026 Guide

📋 Mobile network reference


On this page (7 sections)
  1. Understanding Your Balance: Pay As You Go vs Pay Monthly
  2. Method 1: Use the My O2 App
  3. Method 2: Dial a USSD Short Code
  4. Method 3: Call the O2 Balance Phone Line
  5. Method 4: Check Your Balance Online
  6. What To Do If Your Balance Seems Incorrect
  7. O2 Customer Service Contact Numbers
*#10#
USSD dial code to check O2 Pay As You Go balance from handset
Source: ontopup.com
4444
O2 customer service number to check balance by following prompts
Source: ontopup.com
*104*#
Alternative dial code reported for checking O2 prepaid SIM balance (user-reported, result unclear)
Source: Facebook / Living in Brno group

Key Takeaways

  • There are four main ways to check your O2 balance: the My O2 app, dialling the short code *#10#, calling the automated line 4444, or logging in to the My O2 website.
  • The method and the information you receive can differ depending on whether you are an O2 Pay As You Go or Pay Monthly customer.
  • The My O2 app and website offer the most detailed breakdown of your allowances, including data, minutes, and texts, for both plan types.
  • For a quick credit check on Pay As You Go, dialling *#10# or calling 4444 are the fastest options.

Keeping track of your mobile phone's balance is essential for managing your spending and avoiding unexpected charges. O2 provides several straightforward methods for both Pay As You Go and Pay Monthly customers to check their remaining credit, data, and other allowances. This guide provides a detailed breakdown of each method, helping you choose the one that best suits your needs.

Understanding Your Balance: Pay As You Go vs Pay Monthly

Before checking your balance, it is important to understand what the term means for your specific plan. The information presented will differ significantly between O2's two main customer types.

  • Pay As You Go (PAYG): Your 'balance' is a cash credit amount. When you make calls, send texts, or use data, the cost is deducted from this credit. If you buy a bundle of minutes, texts, and data, your balance check will show both your remaining cash credit and the allowances left in your bundle.
  • Pay Monthly: You do not have a cash balance. Instead, you have a monthly allowance of data, minutes, and texts included in your tariff. A 'balance check' for a Pay Monthly customer shows how much of this allowance you have used and how much remains for the current billing period.

Method 1: Use the My O2 App

The My O2 app is the most comprehensive tool for managing your account and provides the most detailed view of your balance and allowances. It is available for free on both iOS and Android devices.

How to check your balance using the My O2 app:

  1. Download the My O2 app from the Apple App Store or Google Play Store.
  2. Open the app and sign in using your My O2 account details. If you have not registered before, you can do so directly through the app.
  3. Once logged in, your main dashboard will display your remaining allowances.
  4. For Pay As You Go customers, it shows your current credit balance and any active bundle allowances.
  5. For Pay Monthly customers, it displays remaining data, minutes, and texts for the current billing cycle. You can also view and pay your latest bill.

The app also allows you to add 'Bolt Ons' if you are running low on data and view a detailed breakdown of recent charges.

Method 2: Dial a USSD Short Code

For a quick, on-screen update, particularly for Pay As You Go customers, using a USSD (Unstructured Supplementary Service Data) code is the fastest method.

  • To check your balance, dial *#10# and press the call button.

After a few moments, a message will appear on your screen displaying your remaining credit. This service is free to use, even when you are abroad. While primarily for PAYG, some Pay Monthly customers may see their remaining data allowance.

Method 3: Call the O2 Balance Phone Line

If you prefer to hear your balance spoken, you can call O2's automated service. This is a free call from your O2 mobile.

  • From your O2 phone, dial 4444.

Follow the voice prompts to hear an automated reading of your current balance and allowances. Note that to make the call, you may need to have at least one minute of call time credit remaining on your Pay As You Go account.

Method 4: Check Your Balance Online

The My O2 website offers the same level of detail as the mobile app, making it a convenient option if you are on a computer or do not wish to install the app.

How to check your balance on the My O2 website:

  1. Navigate to the official O2 website and click on 'My O2' to sign in.
  2. Enter your registered username and password.
  3. Your account dashboard will show a summary of your plan, including your remaining balance for PAYG or allowances for Pay Monthly.
  4. You can explore further sections like 'Bills' or 'Usage' for a more detailed breakdown of charges outside your allowance.

What To Do If Your Balance Seems Incorrect

Occasionally, your balance might not update immediately after a top-up, or you may see unexpected charges. If you believe your balance is incorrect, first use the My O2 app or website to get a detailed usage breakdown. This can help you identify any out-of-allowance calls, texts, or data usage.

Under regulations from the UK's communications regulator, Ofcom, mobile providers must ensure that the billing information they provide is up-to-date and accurately reflects your usage. They must also notify you when you have used up an allowance included in your plan. If you still have concerns, you should contact O2 customer services. For guidance on disputing a bill, you can refer to resources from Citizens Advice.

O2 Customer Service Contact Numbers

If you need to speak to a person about your balance or another account issue, use the correct number for your plan:

  • Pay Monthly Customers: Call 202 from your O2 mobile. From a landline or other mobile, dial 0344 809 0202.
  • Pay As You Go Customers: Call 4445 from your O2 mobile. From a landline or other mobile, dial 0344 809 0222.
  • From Abroad: For both plan types, call +44 7860 980 202.
  • Business Customers: Call 8002 from your O2 mobile or 0800 977 7337 from a landline.
Crop faceless young woman in casual outfit text messaging on phone in city street in daytime
Photo by Charlotte May on Pexels.

Just dial *#10# and we'll send your balance free of charge.

Frequently asked questions

how do I check my O2 balance by dialling
Dial *#10# from your O2 handset and press call. O2 will send your remaining credit, minutes, texts, and data back to you as a free message. This code works on Pay As You Go SIMs and is free to use even when abroad.
what is the O2 balance check number
Call 4444 from your O2 mobile phone. An automated system will walk you through your account options and read out your current balance. If you're calling from a non-O2 number, use 0344 809 0202 for general customer service.
O2 *#10# not working what do I do
If *#10# is not responding, try calling 4444 from your O2 phone instead to hear your balance through an automated system. You can also check your balance anytime using the My O2 app or website, which shows detailed usage and remaining credit.
is dialling *#10# free on O2
Yes, dialling *#10# on O2 is completely free of charge. This applies whether you're in the UK or abroad, and O2 confirms the balance check is sent back as a free message.
does *#10# work on O2 Pay Monthly
The *#10# code is designed for O2 Pay As You Go SIMs and may not return a useful figure on Pay Monthly contracts. If you're on a Pay Monthly plan, use the My O2 app or website instead to view your full allowance breakdown.

Sources

  1. Check Your O2 Balance - On Top Up (ontopup.com)
  2. Check Your O2 Balance: Credit, Data & Minutes (www.mobiletopup.co.uk)
  3. Problems checking balance from outside UK - O2 Community (community.o2.co.uk)
  4. How do you check balance on prepaid o2 sim? On their webpage it ... (www.facebook.com)

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