What cell service do you have? TMobile, ATT, Sprint or Verizon?
Tried with sim cards of all operators and the internal error displays as described previously. Note that the same internal error occurs when connects to internet through wifi from any router.
Are the devices appearing if you use a web browser and go to mydlink.com with a PC using IE11 or FF?
Yes. Both deviced appear active and show the camera view and router upload speed, ds, devices connected through router, etc in the web browser with IE, FF using the same network wifi that i use to connect with windows phone, but in my WP the internal error is shown.