Sorry to hear you're having issues. I'll be happy to look into this.
Once the device has power (it'll blink when boots, as you've seen), you should see it in the mobile app in a few moments. Please ensure that you have Bluetooth enabled on your mobile device, as the Modulo will connect to your phone via Bluetooth and then use the phone's data connection to connect to the Afero Cloud. Could you verify that you have BT turned on your mobile device for me? Also, if you don't mind, please email me at jgeorge at afero.io and let me know the email address you're using for your Afero account so I can check the logs to see if there have been any connection attempts from your device.