Tweaking custom calling rules in Google Voice (GV) is a killer app that allows you to keep one phone number, but have it route to multiple phones according to your preferences. GV helps you to save money, avoid annoyances and get more. GV enables you to have at least your cell phone set up with the service, under a new number. The procedure is pretty easy where you add a new phone number by clicking on “Settings” in the upper-right corner, then hit the “Phones” tab and click “Add another phone.” 
Templates for customizing calling rules
- Cell minute saver: allows you to have your other phones (at home or office) ring at the same time when your cell minutes are tracked by the minute. You can set your land phones from ringing according to your time preferences or whenever your cell plan goes “free” and when you are free to take the calls probably, during weekends or when you are at home or office.
- Whitelisting: Google Voice provides pretty good caller ID and you can easily ignore a call by having unrecognized callers go right to voice mail.
Google Voice also provides other default options for every caller in its settings: “Do Not Disturb,” which sends every call to voice mail and doesn’t forward text messages.
- Mumblers and speed-talkers: There are times when Google can’t understand what certain folks in your voice mail are trying to say and some really impatient people leave empty voice mails. So, you need to go to Contacts and move everybody who tends to talk softly, quickly or not at all into a group or select them individually and change their greeting to a custom version where you name it “Transcription Reminder” and record a custom greeting.
- Formal or informal greetings: GV enables you to go to Settings, then Groups where you click “Edit” under any contact group that should get a longer, more professional greeting (for example, You’ve reached the voice mail of Dr. Deen and your call is very important to me ….) or make that the default message. As for your friends and family you must set up a short message to save on their cell minutes and patience as well.
