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O2 not answering? Bill wrong? Signal gone? Account locked? Find step-by-step solutions to common O2 problems and learn how to escalate complaints effectively.
O2 Main Number
0344 809 0202
From O2 Mobile
Dial 202 (Free)
O2 WhatsApp
+44 7921 336150
Ombudsman
0330 440 1614
O2 Customer Service Hours: Mon-Fri 8am-9pm | Sat 8am-8pm | Sun 8am-6pm
Mobile phone services have become essential to daily life in the UK, with most people relying on their devices for communication, banking, navigation, and countless other activities. When issues arise with your O2 service, it can be frustrating and sometimes urgent to resolve them. This comprehensive FAQ page addresses the most common problems O2 customers face and provides practical solutions based on publicly available information and standard industry practices.
The questions and answers on this page cover five main categories of issues: contact and support problems (when you can't get through to O2), billing and payment disputes (incorrect charges, refunds, and payment difficulties), network and signal issues (when your phone isn't working properly), account management problems (login issues, cancellation, and upgrades), and escalation procedures (what to do when O2 can't resolve your problem).
It's important to understand that while many issues can be resolved through self-service or by following troubleshooting steps, some problems require direct contact with O2 customer service. Account-specific issues, billing disputes involving refunds, and certain technical problems that require network-side investigation will need O2's involvement. The guidance below helps you understand when you can resolve issues yourself and when you need to contact O2 directly.
This FAQ is organised by category to help you find relevant information quickly. Each question includes detailed steps you can take, along with guidance on when and how to contact O2 if self-help doesn't resolve your issue. We recommend reading the entire answer for your question, as later steps often depend on earlier ones, and there may be important notes or warnings relevant to your specific situation.
Remember that mobile network technology and O2's specific processes can change over time. While we strive to keep this information current, always confirm important details (such as phone numbers or specific procedures) with O2 directly when taking action that affects your account or involves financial matters.
Solutions when you cannot get through to O2 customer service
If O2 phone lines are busy or you have been on hold for hours, try these alternatives that often get faster responses: Message O2 on WhatsApp at +44 7921 336150, use O2 Live Chat on the website, Tweet @O2 or message on Facebook (public complaints get prioritised), use the My O2 app for many self-service tasks, or try calling during off-peak hours (8am-10am or after 7pm on weekdays). Tuesday to Thursday mornings typically have the shortest wait times.
The best times to call O2 are early morning between 8am-10am when lines first open, or after 7pm on weekdays when call volumes drop. Avoid Monday mornings (highest volume of the week), lunch hours between 12pm-2pm, and days immediately after bank holidays. Tuesday, Wednesday, and Thursday mornings offer the best chance of getting through quickly. Some customers report 2+ hour waits during peak times.
When you call O2 on 0344 809 0202, say 'speak to an advisor' clearly when prompted, or press 0 repeatedly to skip the automated menu. Have your account details ready - O2 number, account PIN, and the reason for your call. Being prepared speeds up the verification process. If wait times are excessive, try WhatsApp or Live Chat as alternatives.
If O2 keeps disconnecting you, try calling from a different phone or location in case of signal issues, use a landline if possible, call outside peak hours, or switch to Live Chat or WhatsApp which do not have the same disconnection issues. If you were mid-conversation, ask the next advisor to find your previous case notes.
If O2 Live Chat is unavailable or showing as offline, try: WhatsApp on +44 7921 336150, Tweet @O2 for public assistance, the O2 Community forum at community.o2.co.uk, calling during opening hours, or visiting an O2 store in person. Live Chat availability can vary based on demand and staffing.
How to resolve billing issues, disputed charges, and refunds
If O2 has taken payment twice, call 0344 809 0202 with your bank statement showing the double charge. Explain the situation and request a refund. O2 can refund directly to your bank account (takes 3-5 working days) or credit your O2 account immediately. Always get a reference number for your refund request. If O2 refuses or delays, escalate to the Communications Ombudsman.
Download your itemised bill from My O2 to identify the specific charges you dispute. Call O2 billing on 0344 809 0202 and explain which charges you believe are incorrect and why. O2 must investigate disputed charges. If you did not authorise premium rate calls or third-party charges, you may be entitled to a refund. Request the dispute in writing for records.
If your O2 direct debit failed, you will receive a notification and may face a late payment charge (typically around £5). O2 will retry the payment after a few days. You can make a manual payment through My O2 or by calling 0344 809 0202 to avoid service interruption. If you are having financial difficulties, speak to O2 about payment plans before they take further action.
If O2 is still charging you after cancellation, gather evidence of your cancellation (reference numbers, dates, confirmation emails). Call 0344 809 0202 and demand they stop the charges and refund any taken after your cancellation date. If O2 refuses, raise a formal complaint and escalate to the Ombudsman. You can also contact your bank to dispute the direct debit.
If O2 refuses a refund you believe you are entitled to: Ask to speak to a supervisor or manager, raise a formal complaint and get a reference number, wait 8 weeks (or request a Deadlock Letter sooner), then escalate to the Communications Ombudsman on 0330 440 1614. The Ombudsman can order O2 to refund you and pay compensation for poor service.
If you received unexpected roaming charges, check: Were you in a Travel Inclusive Zone country? Did you exceed your roaming allowance? Were data roaming and roaming calls enabled? If you believe the charges are wrong, call O2 billing with your travel dates and usage details. O2 must have warned you about charges. If they failed to notify you, you may be able to claim the charges back.
Fixing network issues, no signal, data not working, and coverage problems
If your O2 signal has suddenly disappeared: Toggle airplane mode on then off, restart your phone completely, remove and reinsert your SIM card, check the O2 network status page for outages in your area, try your SIM in a different phone to rule out device issues, and check your phone settings have not accidentally changed. If the issue persists, call O2 technical support.
If O2 data has stopped but voice works: Check your data allowance in My O2 (you may have used it all), ensure mobile data is enabled in settings, toggle mobile data off and on, reset APN settings to O2 defaults (APN: mobile.o2.co.uk, Username: o2web, Password: password), restart your phone. If still not working, call O2 technical support for account-side investigation.
Poor indoor signal is often caused by building materials blocking signals. Solutions: Enable WiFi Calling in your phone settings (free on most O2 plans, uses your home WiFi), move closer to windows, consider a mobile signal booster, report the issue to O2 who may investigate local coverage. Check that 4G is enabled as it often has better indoor penetration than 3G.
To fix O2 WiFi Calling: Ensure your device supports it (check O2 website), enable it in Settings > Phone > WiFi Calling (iPhone) or Settings > Connections > WiFi Calling (Android), make sure you are connected to WiFi with good internet speed, restart your phone, check O2 has WiFi Calling enabled on your account. Some older plans may not include WiFi Calling.
If O2 4G/5G is not working: Check your phone supports 4G/5G and it is enabled in network settings, verify you are in a 4G/5G coverage area using O2 coverage checker, try toggling airplane mode, restart your phone, check your SIM card is 4G/5G compatible (older SIMs may not be). If still not working, O2 may need to refresh your network settings remotely.
If O2 calls keep disconnecting: Check signal strength in your location, try moving to a different area, restart your phone, check for software updates, try your SIM in another phone to rule out device issues, enable WiFi Calling as a backup. If many calls drop, report it to O2 who can investigate if there is a local mast issue or account problem.
Fixing account issues, password resets, and My O2 app problems
If your My O2 account is locked (too many wrong passwords or security concerns): Wait 30 minutes and try again, use the 'Forgotten password' option to reset, if the reset email does not arrive check spam/junk folders, or call O2 on 0344 809 0202 to verify your identity and unlock your account. Have your O2 number and security details ready.
If the O2 password reset email is not arriving: Check your spam/junk folder, verify you are using the correct email address registered with O2, wait 10-15 minutes (emails can be delayed), try requesting the reset again. If still not arriving, the email address on your account may be wrong - call O2 on 0344 809 0202 to update it and verify your identity.
If the My O2 app keeps failing: Update the app to the latest version, clear the app cache and data, uninstall and reinstall the app, check your internet connection, try logging in on a different device or the website. If using mobile data, try WiFi instead. Some users find the app works better on WiFi than mobile data.
If O2 says your account does not exist when you try to log in: You may be using the wrong email address or phone number, you may have multiple O2 accounts, or there may be a system issue. Call O2 on 0344 809 0202 with your account details and they can look up your account and help you access it.
How to leave O2, get your PAC code, and keep your number
If you texted PAC to 65075 but did not receive your code: Wait up to 10 minutes (there can be delays), check the text was sent from the O2 number you want to port, ensure your phone can receive SMS, check you have credit if PAYG. If still not received, call O2 on 0344 809 0202 or request via My O2 online. The PAC is valid for 30 days once received.
O2 legally cannot refuse to let you cancel. To cancel: Text PAC to 65075 (to keep your number) or STAC to 65075 (to lose your number). O2 must provide the code within 60 seconds. If within minimum term, you will pay early exit fees. O2 may try retention offers but cannot block your cancellation. If they obstruct you, report to Ofcom.
O2 early termination fees are calculated as the remaining monthly charges until your contract ends. With O2 Refresh, you pay off remaining device cost separately. To avoid: Wait until your contract ends, or check if O2 has made service changes that allow penalty-free exit. Call O2 to get an exact quote for your early termination charge.
If O2 keeps charging after you left: Confirm your cancellation was processed (check for confirmation email/letter), call O2 with your cancellation reference to demand they stop charges, contact your bank to cancel the direct debit and dispute any charges taken after cancellation. Raise a formal complaint and escalate to the Ombudsman if unresolved.
If your number did not port to your new network: Contact your new network first as they manage the port, then call O2 to check the PAC was processed correctly, ensure the PAC has not expired (30-day validity), check the number matched exactly. Ports can take up to 24 hours. If stuck, contact Ofcom who oversee number porting regulations.
Fixing SIM not detected, eSIM issues, PUK codes, and device problems
If your O2 SIM is not detected: Remove and reinsert the SIM card, clean the SIM contacts gently, try the SIM in a different phone to rule out SIM damage, try a different SIM in your phone to rule out phone issues, restart your phone. If the SIM works in another phone, your phone's SIM reader may be faulty. If the SIM does not work anywhere, order a replacement from O2.
If your O2 eSIM will not activate: Ensure your phone supports eSIM and is unlocked, check you have a strong internet connection (WiFi recommended), scan the QR code again carefully, restart your phone after scanning. If the QR code has already been used, you need a new one from O2. Call O2 support if activation continues to fail.
Your O2 PUK code can be found: In the My O2 app under account settings, by logging into My O2 online, on the plastic card your SIM came in (if you still have it), or by calling O2 on 0344 809 0202. You need the PUK after entering the wrong PIN three times. Be careful - entering the wrong PUK ten times will permanently lock your SIM.
If your O2 phone is stolen: Immediately call O2 on 0344 809 0202 (or 202 from another O2 phone) to block your SIM and prevent fraud, report to the police and get a crime reference number, if you have O2 insurance start a claim, use Find My iPhone or Find My Device to try locating it, change passwords for any accounts accessible from the phone.
To find a lost O2 phone: Use Find My iPhone (Apple) or Find My Device (Android) to locate, ring, or lock it remotely. If you cannot find it, call O2 on 0344 809 0202 to block your SIM. O2 cannot track your phone location for you. If you believe it is stolen, report to police. Consider remotely wiping data if the phone contains sensitive information.
How to complain, escalate to management, and contact the Ombudsman
If O2 has not resolved your complaint: First ask to speak to a supervisor or manager, if still unresolved ask for the complaints team, request a Deadlock Letter if O2 says they cannot help further. After 8 weeks (or with a Deadlock Letter sooner), escalate to the Communications Ombudsman on 0330 440 1614. The Ombudsman is free and can order O2 to compensate you.
Contact the Communications Ombudsman: Phone 0330 440 1614 (Mon-Fri 8am-6pm), Email enquiry@commsombudsman.org, Website commsombudsman.org, Post P.O Box 730, Warrington WA4 6WU. You need your O2 complaint reference and evidence of the issue. The service is free and independent.
O2 compensation depends on the issue: Network outages may warrant bill credits or contract exit, billing errors should result in full refunds plus goodwill, poor service can result in Ombudsman-ordered compensation. The Ombudsman can award up to £10,000 but typical awards are £50-£500. Document all time spent and financial losses to support your claim.
If O2 gave you incorrect advice that resulted in financial loss, you can claim compensation. Document what you were told, when, and by whom, plus evidence of the costs incurred. Raise a formal complaint with O2 citing their error. If O2 refuses compensation, escalate to the Ombudsman who can order redress for losses caused by misinformation.
A Deadlock Letter is issued when O2 admits they cannot resolve your complaint to your satisfaction. To request one: Call O2, explain you want to escalate to the Ombudsman, and ask them to issue a Deadlock Letter. O2 should provide this in writing. With a Deadlock Letter, you can go to the Ombudsman immediately without waiting 8 weeks.
Problems with upgrades, contract terms, and O2 Refresh
O2 may refuse upgrades due to: Unpaid bills or poor payment history, being too early in your contract, failed credit check for the new device, or account issues. Check My O2 for your upgrade eligibility date. If you believe you should be eligible, call O2 to understand why you were refused. Improving credit score or clearing outstanding balances may help.
With O2 Refresh, you can upgrade early by paying off the remaining balance on your Device Plan. Check your remaining balance in My O2. Once paid off, you can start a new contract with a new phone. Alternatively, use O2 Switch Up which lets you swap phones every 90 days with O2 paying off your old device when you trade it in.
If you have O2 Refresh, your bill should drop when the Device Plan ends because you only pay the Airtime Plan. Check My O2 to confirm your Device Plan has ended. If your bill has not reduced, call O2 on 0344 809 0202 to query it. You may also be out of contract and able to negotiate a better deal or switch networks.
O2 can apply annual price increases linked to inflation (CPI + 3.9%) as stated in your contract terms. This is legal and you agreed to it when signing. However, if O2 makes other changes that negatively affect you, you may have the right to exit without penalty. Check the specific change and contact O2 if you believe the increase is unfair.
Request to speak to a supervisor or complaints team if frontline staff cannot help.
After 8 weeks or if O2 says they cannot help further, request a Deadlock Letter.
Call 0330 440 1614 or visit commsombudsman.org. Free service that can order compensation.
AnswersPro is an independent help resource and is not affiliated with O2 or Virgin Media O2. All information is provided in good faith to help O2 customers. For official support, contact O2 directly.