No, there is a short code sent to the network to make one of the the cards the active card, only one receives calls at a time.

It was designed in the days of fixed car phones and separate handhelds, when you got in the car you would short code to make the car phone live and vice versa to the handheld mobile when you left the car.

Surely if you switch the other phones off the phone which is on will ring? Or am I missing something?

What about using Skype ? You can redirect a Skype number to multiple destinations simultaneously.

This thread is from 2006.