You must have a Data Plan to use BBM
Start at the home screen
hold the alt button while you click the trackwheel
scroll to show all and click trackwheel
see if the icon is visible but faded
if yes
roll to the icon hold the alt button click trackwheel and select hide (to unhide)
if no
you need to determine which device OS is on the BB
4.2 has BBM included...resend service books (
DO NOT install from link below)
4.1 OR OLDER needs a separate install from here
BlackBerry - BlackBerry Messenger