Send an email to firstname.lastname@example.org in plain text format, no signature, preferrably from a mobile device like a pager or cellphone.
In that email, put at minimum the area code and prefix, such as "248-683" or put in the whole number, it doesn't matter, as long as the area code and prefix are dash seperated.
Then see what happens. Note that its formatted to fit on the screens of most cellphones. Use in combination with ANI for loads of fun.