Connecting Samsung Galaxy through ADB

I was having difficulty getting my Samsung Galaxy S4 to connect/recognize through ADB. After following the instructions to connect my phone for development I was still not seeing it in the list using adb devices.

The simple solution for me was to go to the [Developer options] on the actual phone and make sure "USB Debugging" was selected. Toggling this on brought up the dialog asking whether to accept an RSA key that allows debugging through this computer, mentioned in the notes on the page linked above.

Other notes:

1. To enable developer options on a Samsung Galaxy S4, make sure you don't overlook this bit of information:
   Note: On Android 4.2 and newer, Developer options is hidden by default. To make it available, go to Settings > About phone and tap Build number seven times. Return to the previous screen to find Developer options.
2. This is where you'll find the ability to toggle USB Debugging.
3. Help getting the USB Driver can be found on this page. My solution is specific to the Galaxy S4 but probably similar for all other recent phones using Android 4.2+.