I built Linphone Android 4.0.0 with -DENABLE_UPDATE_CHECK=1 specifically to test this feature, but I doesn't see any submenu to manually trigger the check, its interval, or any notifications. I'm aware that I also need to change version_check_url_root in res/raw/linphonerc_factory to an URL with an existing android/RELEASE file, but I want it to work first. The relevant code is found in submodules/linphone/coreapi/linphonecore.c (search for ENABLE_UPDATE_CHECK).