I hope I am not responding too late in this thread!
There are numerous SMS auto-forwarding tools for Android (iPhone API unfortunately does not provide access to message broadcasts among other restrictions, so no such apps without hacking).
If I may, here's a plug for my app
.
PhoneLeash will auto forward SMS (and missed call notifications) to either an email address or another phone (as SMS). You can even reply to the incoming SMS, via email-to-SMS, or SMS from another phone, Google Voice, Skype. When I travel internationally, I often leave my phone behind at home or in the hotel room connected to WiFi, but have complete access to my SMS.
See
here for more. Btw its free.