You can read here: http://pinouts.ru/CellularPhones-A-N...r_pinout.shtml
I use one cable that came with a belkin 3 port power strip + 2 port
USB charger. It specifically states it works with Motorola. You can
probably find the same on eBay. This sort of cable will not let you
use data on the phone but will only charge it.
As the other poster stated you can install the USB driver.
Even worse is what VERIZON does. Just the wording of the message shows
how horrible they are. Same phone but with non-Verizon firmware says
something not as harsh as "UNAUTHORIZED CHARGER" ... "Unable to charge"