My latsest Cam_App of the week is>>> Google Voice

Google Voice enhances the existing capabilities of your phone, regardless of which phone or carrier you have - for free. Includes
One Number: Use a single number that rings you anywhere.
Online voicemail: Get transcribed messages delivered to your inbox
Cheap calls : Free calls & text messages to the U.S. & Canada. Super low rates everywhere else.
You can now use you own number, not Google ...