There are times when you want to give out a phone number but you do not want to give out a live direct number. This happened to me when making some contact information cards for the library classes I volunteer teach. I certainly did not want to be giving out my cell phone number to just anyone who showed up for the classes. So I dusted off something I setup a while back. Grandcentral.com.
Grandcentral is now a Google owned property. It lets you pick a phone number you can keep effectively for life. The fun then begins. You can import the contact information from your computer and teach it how to route calls based on who is calling. So you could setup one number and if it is your spouse it rings your cell number and work number effectively forwarding the call. If it is an unknown stranger you can have it go to voicemail instead. Then Grandcentral will even email you a link you can click to play any recorded voicemail. Optionally you can have it SMS your cell phone to notify you of voicemail.
You can setup rules so certain contact numbers only get forwarded to certain real numbers for you such as home, work and cell. You can do this by grouping those contacts as well.
So if you have need to share a common number but want the control to protect your direct number privacy then Grandcentral is a great tool. It is free so create an account and give it a whirl.
PS You can even change the routing rules based on callerID from the call logs. So if someone starts bugging you, just route them to call blocked… =)