Smart Dialing for those who don't know is a feature already available on iPhone and Android phones which allows you to search for contacts right from the dial pad by using the alphanumeria keypad to type names which pull up list of contacts that match. This eliminates the need to go to your phone book to search for contacts.
This obviously simple feature has been missing since the launch of Windows Phone 7, but it looks like it will be coming back FINALLY in Windows 10 and it's coming with extra features as well.
Here is a video demo of the smart-dialer running on Windows 10 Mobile form the WinHEC event going on in China...
The demo was done on a Windows 10 device simulator and it showed how the smart dialer works.
As you can see it not just pulls search results from your contacts list but from the internet directory service (like Yellow Pages).
What directory service it uses might be independent on the region you are in.
This is very exciting. This is one feature I never could understand why Microsoft omitted from the Windows Phone OS all these years.
Let's hope this feature is part of the many features we will get to try out when the next Windows 10 Mobile technical preview build is released.