Finding your phone number on the phone is not easy. WhatIsMyNumber.io is a free app for Android and the web that will find your mobile number in seconds whenever you have a question “What is my phone number”. Just install the app on your device and tap "Detect Now" to get started. The My Number app will scan your SIM card and show you your phone number. If the phone number is not written on your SIM card, the app will give a free number you can call to detect your number using caller ID and dis