Currently Being ModeratedMay 11, 2013 6:56 AM (in response to nick.nelson)
There is no SMS forwarding.
What you could do is port your personal number to Google Voice (this would require getting a new number for the personal phone from your carrier that you do not give to anyone.
Once the existing number is ported to GV, then install the Google Voice App on both phones and authenticate to your account.
All your SMS and calls sent to that number will be delivered to any phone with the GV app installed.
The downside to this is that GV does not support MMS messages.