I need help at my GSM-Project. Somehow I am not able to connect to the Network. I already checked if I forgot something, but I don't think so. The LTE- and GPS-Antenna are connected correctly to the board and a valid SIM(my own for testing, without PIN) is inserted. I did manage to receive a Message and get some GPS-Informations(which had a little deviation). The "NET" indicator LED keeps flashing fast, which tells me that the module hasn't logged in to the Network, but I couldn't it explain to myself.
Here is a link to the module's Manual: