If you have overclocked the Pi3, or are thinking about overclocking it, or you just want to check to see if the warranty is still good, here is how to do it:
note- this checks to see if the warranty bit has been set or not
cat /proc/cpuinfo | grep 'Revision'
Warranty good: a02082
Warranty voided: 2a02082
Voided Warranty:
