We bought the TP-Link TL-MR6400 to use for our solar panels, since we don't have a "normal" internet connection yet. We bought a simcard (provider KPN Netherlands) and we use pre paid internet on it. The simcard works in our phones, but not in the router. We can connect a phone to router and send messages with the phone connected to the wireless internet of the router but we are not able to visit or browse any websites. The phone says ' no internet connection'. Also, our solar panels can't connect to the router unfortunately. What could it be?