What is My Number.io
How to check your own number on Optus
To check your own Optus number, Text the digit 1 to 9999 — it's free and you get a text back with your number. Prefer not to text? iPhone: Settings → Phone → My Number. Android: Settings → About phone → SIM status. Or the My Optus app. Or detect it automatically.
Step by step
- Open Messages. Open your SMS/messaging app.
- Send the text. Text the digit 1 to 9999.
- Read the reply. You receive a free text back showing your own number.
What you'll see: Optus replies with a free text containing your own number.
If that doesn't work
iPhone: Settings → Phone → My Number. Android: Settings → About phone → SIM status. Or the My Optus app.
Free within Australia.
What your Australia number looks like
A Australia mobile number is mobiles start 04 (10 digits national), written +61 4XX XXX XXX — for example 0412 345 678 / +61 412 345 678. 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 Optus
Optus is Australia's second-largest carrier, owned by Singapore's Singtel. Text the digit 1 to 9999 (free within Australia) and Optus replies with your own number.
Optus quick facts
| Carrier | Optus |
|---|---|
| Also known as | Optus Mobile |
| Network type | Mobile network operator (MNO) |
| Parent company | Singtel |
| Country | Australia |
| Customer care | 133 937 |
| Self-number method | Text the digit 1 to 9999 (SMS) |
FAQ
How do I check my Optus number?
Text the digit 1 to 9999. 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: iPhone: Settings → Phone → My Number. Android: Settings → About phone → SIM status. Or the My Optus app. Or detect your number automatically with the tool.
Other Australia carriers
Method last verified 2026-06-15 · Optus official help