Android - adb devices error device not found

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I've been developing some basic android applications.  

After carrying out some testing using the emulator within eclipse I wanted to deploy the app to my phone so I could show to some customers.

You'd think it would be fairly straight forward, not so.  

Anyway  a little problem I came across was when I ran the command 

adb devices

From the platform-tools folder it was showing no devices attached even though I'd connected my phone and I'd set USB debug mode according to the android SDK how-tos.

I also tried to reboot the adb daemon with

adb reboot recovery

Again no joy

Finally I tried the following and it worked

adb kill-server
adb start-server

And finally adb devices listed my phone correctly


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