Text Message forwarding basics
Anyone can send a text message to your Google number and the message will be forwarded only to the phones you've marked as Mobile in the Phone Type section of your Phones tab.
If you reply to the message, your replies display your Google number as the caller ID and the whole conversation is stored and searchable from your inbox.
The text messages that are sent to your Google number will also be displayed on the website. You can reply to the text message from the Web as well.