Can you have a SIM card with the same number on two phones?

Can you clarify for me if it's actually possible to have a SIM card with the same number assigned to it on two separate phones simultaneously? I've heard conflicting information about this and I'm curious if there's a way to achieve this functionality, especially in light of the increasing use of dual-SIM phones. Is there some kind of advanced technology or service that allows for such a setup, or is it simply not feasible due to the way mobile networks and SIM cards are designed? Your expertise in this field would be greatly appreciated.