Click to call phone numbers from your Google mail text or contact :

Now you can call phones built right into Gmail, you don’t have to copy and paste your number or type in Google chat to call your friends. Simply click on the number in your mail and your dial-paid will appear to call that number.

This facility was missing in Google phone. If you don’t see this function in your Gmail, then you need to install the Google Voice and video plugin. Moreover you can always call your contacts as usual by clicking the phone icon.

We would like to remind you that the calls to USA and Canada are free for year 2011, so enjoy the free convenient calling right away from Gmail.

More details on Gmail Blog