Yes, i have the same problem: The router detects my cards in SIM 2 Slot, it also chooses the right carrier and shows all the other usual number like reception signal but: it does not connect - it does not connect when SIM2 is primary SIM and it does not connect when SIM2 is secondary SIM. Both Cards (telekom + O2) are working very well in SIM 2 Slot or in other routers.