If your mobile device is lost or stolen, no one can access your account without knowing your password and, in some cases, your unique username. To prevent unauthorized access to your account, you can deactivate your phone online using Online Banking. To deactivate your mobile device, log into Online Banking from a computer, select “Profile,” and next to Mobile Banking click “Manage Devices.” Select “Stop using this device for Mobile Banking” in the drop down box and click “Go.”