I received a Adafruit Feather 32u4 FONA as a gift and have read the great, comprehensive document Adafruit put have put together surrounding pinouts, examples etc for the board. I am having issue understanding the section on the KEY pin, I understand that it is used to put the cellular module to sleep, but in order to do this it is mentioned to “cut the trace and wire it to a micro controller pin”. Does this mean that in order to utilize the on/off functionality of the SIM module I have to slightly butcher my new shiny board instead of using the pin directly?
Yes, you will need to physically cut the trace to use the on/off feature. This is common on development boards. It could be done with a jumper but that would add cost and/or require a larger board.
You will see on the back of the board there are 2 large pads connected by a thin trace. You can use an exacto knife to cut the trace. To repair the cut you use a blob of solder to bridge the gap between the pads.