Generally when we see the summary screen of Company, Person, etc. we see that the each field value is set below the field caption. But in the Phone/Email section of Company/Person entity value is displayed on the same line as the caption. Please refer the below screen shot.
If you want to place the value below the caption then you can do the same by inserting some client side scripting.
You can even set the font size and font color for the phone number value. The result would now look like this.
Please note that this script will only work under the Company | Summary Tab | Phone/Email Section. It will not work when you will deal with New Company Screen or even with phone/email tab under the company Tab Group.