About What is My Number

What is My Number (whatismynumber.io) is a free tool that helps you find your own phone number on any device — your everyday phone, a brand-new SIM, or a work handset — in seconds, with no sign-up.

Detect my number

How it works

There are two ways we find your number, depending on where you use the tool:

• On the web: we give you a free test number to call. When you call it, we read the calling number from the caller ID and show it back to you on the page — we never pick up, so the call is free and nothing is charged.
• In our apps: where the device allows it, the app reads your number directly from the SIM card, so you see it in one tap.

Prefer to do it yourself? You can also read your number from your phone's Settings, or by dialling your carrier's short code — see our check your number by carrier guide.

Where you can use it

What is My Number works in any web browser and as a free app on every major platform:

• Android app
• iPhone / iOS app
• Chrome extension
• Windows app (Microsoft Store)

Is it free?

Yes. The website and the Android, iOS, Chrome and Windows apps are all free to use, with no account or sign-up required.

Who is behind it

What is My Number is an independent tool, built and maintained by a small team. Have a question, found a bug, or want to suggest a feature? Email support@whatismynumber.io — we read every message.

Your privacy

We care about how your data is handled. For the full details on what we collect and how it is used, please read our Privacy Policy.