is just to run the phone number through the search engine. Make sure to include the area code and the dashes between the sets of numbers. You might notice that some girls ads put the area code in parentheses or leave out the dash between one set of numbers. It's probably to keep a simple cut and paste from working and exposing an agency or some undesirable carachter trait. Google reads the lack of dashes as a mathematical equasion and searches the numbers in parentheses seperately from the other numbers rendering a useless search. Google is a great tool if used properly.