In article ,
newshound wrote:

On my android phone, by default the USB port will only accept power. You
have to pull up a window and positively enable data transfer.

https://krebsonsecurity.com/2011/08/beware-of-juice-jacking/
³One attendee claimed his phone had USB transfer off and he would be
fine. *When he plugged in, it instantly went into USB transfer mode,²
Markus recalls.* ³He then sheepishly said,* ŒGuess that setting
doesn¹t work.'²