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 ...

Learn Excel 365 number formatting to create clear, professional spreadsheets. Learn essential tips and advanced techniques for data clarity ...

Learn how to format numbers in Thousands, Millions, and Billions in Excel and Google Sheets. Use number Formatting to convert numbers.

These newbie mistakes are uncalled for because Excel placed several number formatting options front and center in the Number section of the Home tab: Click for larger image.

If the Excel cell format is not changing to a number because the Number formatting is not working, take these steps to fix the issue.