Here's what Gmail Blog Posted >
Even the best of us forget our passwords from time to time. In fact, recovering passwords is one of the top reasons people visit the Gmail Help Center. To help with these situations, we recently added the ability to recover your password via text message.
To turn this on for your account, just sign in, select 'Change Password Recovery Options,' enter your cell phone number and click 'Save.'
Next time you forget your password, enter your username on the password-assistance page, and Google will text you a recovery code. No need to check another email account or even leave the page.
In general, it's a good idea to add as many password recovery options to your Google Account as possible, like a secondary email address and security question. And don't forget to keep them up-to-date.