What is My Number.io
How to check your own number on O2 UK
To check your own O2 UK number, Text the word NUMBER to 2020 — it's free and you get a text back with your number. Prefer not to text? Check the My O2 app, or Settings → Phone / SIM status. Or detect it automatically.
Step by step
- Open Messages. Open your SMS/messaging app.
- Send the text. Text the word NUMBER to 2020.
- Read the reply. You receive a free text back showing your own number.
What you'll see: O2 replies with a free text containing your own mobile number.
If that doesn't work
Check the My O2 app, or Settings → Phone / SIM status.
O2 replies by text with your mobile number; free.
What your United Kingdom number looks like
A United Kingdom mobile number is mobiles start 07 (11 digits national), written +44 7XXX XXXXXX — for example 07400 123456 / +44 7400 123456. If what you see doesn't match that, you may be reading a different field (such as the ICCID/SIM serial) rather than your number — re‑check with the method above.
About O2 UK
O2 UK is run by Virgin Media O2 and is one of the UK's largest networks. There's no single 'show my number' USSD on O2 — the reliable route is a text to 2020, the My O2 app, or your phone's settings.
O2 UK quick facts
| Carrier | O2 UK |
|---|---|
| Also known as | O2 |
| Network type | Mobile network operator (MNO) |
| Parent company | Virgin Media O2 |
| Country | United Kingdom |
| Customer care | 202 — free from an O2 phone |
| Self-number method | Text the word NUMBER to 2020 (SMS) |
FAQ
How do I check my O2 UK number?
Text the word NUMBER to 2020. You get a free text back with your own number.
Is it free?
Yes. Checking your own number this way is free, and the whatismynumber.io auto-detect tool and apps are free too.
What if it does not work?
Codes can vary by plan or region. Use the fallback: Check the My O2 app, or Settings → Phone / SIM status. Or detect your number automatically with the tool.
Other United Kingdom carriers
Method last verified 2026-06-15 · O2 UK official help