Hey
We are developing an android app.
In this app you can set your availability to receive calls for your phone contact.
Like on Skype, gtalk you can set your status as online, busy, offline(those green red symbol) …we have implemented the same thing for phone contact.
And based on your availability the app will allow calls or it will decline the call and send an automated sms to the caller.
The app is working fine on Indian phone nos. I need to test it on international nos. I need to check whether it is supporting the country code or not.
I will send you guys the apk file for testing as it is still in development phase.
I assure you that it won’t cost you more than 2 mins 
Thanks
sandeep