Or they could just do what Apple did with iMessage and just basically use the user's mobile phone as the SMS gateway. SMS I send from my laptop actually get rou

Or they could just do what Apple did with iMessage and just basically use the user's mobile phone as the SMS gateway. SMS I send from my laptop actually get routed to my iPhone and sent to my carrier as a normal SMS using my own plan. This also has the big plus the SMS actually will originate from your mobile number (rather than the SMS gateway's number). Can't see why Google could've gone down this route given Apple has done it with huge success...