Xadow BLE not seen by Android phone

Hi there, I’ve tried following the Wiki tutorial seeedstudio.com/wiki/Xadow_-_BLE without luck. I uploaded the “Xadow BLE Slave device” demo code, then opened the “BLE_Example” apk on an Android 4.4 device, but still can’t see the Xadow listed in the app. Has anyone else had this problem?