Do doc for google fi

documentation/modules/auxiliary/client/sms/send_text.md

@@ -67,6 +67,8 @@ how to identify the carrier of a phone number. There are many services that can
 
 http://freecarrierlookup.com/
 
+Note: If the phone is using Google Fi, then it may appear as a different carrier.
+
 ## Gmail SMTP Example
 
 Gmail is a popular mail server, so we will use this as a demonstration.

lib/rex/proto/sms/model.rb

@@ -18,7 +18,7 @@ module Rex
           :tmobile => 'tmomail.net',             # T-Mobile
           :verizon => 'vtext.com',               # Verizon
           :virgin  => 'vmobl.com',               # Virgin Mobile
-          :google => 'msg.fi.google.com'
+          :google => 'msg.fi.google.com'         # Google Project Fi
         }
 
       end