Hello, I have a problem with my Mikrotik LtAP LTE device, I cannot configure the sim card to receive internet services, I was configuring the APN of the sim card, but it is not running and it does not receive internet signal from the provider. What should I do?

I want to know, how to configure the GPS in my LtAP LTE mikrotik devices and if I have to activate the other slots to implement more SIM cards?