Well out of the blue the blackberry wifi icon on my z10 has disappeared. Even when I'm connected to data services theres no sign of the icon. Ive been connected to other peoples wifi routers and the same thing every time. All i see on the top right of the screen is the wifi signal bars and the mobile signal, no blackberry icon to be seen.
The icon you mean indicates the connection to BlackBerry services. Sometimes the connection doesn't come back after you lost the signal. Usually setting the device into airplane mode and back to normal works for me. If not a reboot should solve the problem.