You can put a circle around a number in Excel, using the Illustration feature, using Symbol or using the Quick Access Toolbar. Learn how!

When you type a seven-or-ten-digit phone number into an Excel cell that uses the phone number format, Excel will automatically change the way the number looks so that it appears as a phone number.

You can add a zero before a number in Google Sheets and Excel using this tutorial. You need to change cell formatting or use function.