Most of us are dealing with information overload to some degree or another, so it's not all that surprising that when someone asks us for our phone number, we sometimes draw a blank. After all ...

Open the Find My app on your iPhone, iPad, or iPod touch ... You can also display a custom message with your phone number on the Lock Screen and keep track of your device’s location.

Step 3: Find your iPhone under the Devices section ... Apple will also display a phone number and a message on the screen, allowing anyone who finds your iPhone to contact you.