Managing Network of Contacts

[David Schomer]

"Networking is how you become successful in Real Estate..." is said time and time again.  How does everyone manage their contacts?  I currently have a stack of business cards, notes in my phone, and random texts that I would like to organize and share with my business partner.  For instance, it would be nice to have a "folder" or "group" of contractors in my area.  Perhaps an area to add a few notes about the individual?

Any help is very much appreciated!

-David