If you are trying to register or re-register your device but cant find the iotty Wi-Fi, the procedure to follow is very simple:
Remove the glass from the iotty device;
gently press on the physical AP button for 10 seconds (there are 2 small buttons, the AP is the lower one) using a small object, e.g. a paperclip.
Go back to the Wi-Fi section of your phone, a "IOTTY_serial_number" Wi-Fi network will appear and you will be able to register your device.