To cancel an SOS call from your mobile application:
Android and iPhone users: Slide the slider back to the left.
Mobile apps using the J2ME applications (Nokia, BlackBerry, MIRS): Press 0
When asked, enter the user password and press ENTER, or on the button to authorize the password. The application will return to the main screen.
Note: If this doesn't help, and closing the SOS call from the NowForce Dispatcher doesn't cancel the SOS call on the mobile application, please uninstall the application and then reinstall it.