How you insert the sim card depends on the product, and there are usually labels on the product to help guide you. You want to insert the sim card per the instructions. You will want to enter the APN in settings in the product. You will also want to “Reset Interface” on Mobile Data 1 if you have just inserted or changed sim cards. Be patient and wait for approximately 5 minutes after resetting interface before expecting it to connect. You will want to click the Mobile Data 1 Interface in the middle of it and click OK to connect to the Internet with that interface. We hope and recommend that you have the cellular topside antenna installed and connected to the product. There should be a Sim Set Up instruction sheet with the device.