Can low-level central control add 4g module?

Navigation installation of 4G module requires GSM card, so direct installation is not recommended. First, the cost is too high, and second, the performance is unstable. It is suggested that you can send WiFi on your mobile phone. The specific operation is that the mobile phone opens the hotspot to send. Turn on WiFi, and you can use it normally by connecting hotspots. The 4g module is integrated in the central control main version without card slot and cannot be changed. Get yourself a portable Wi-Fi and insert your unlimited card into the car sample. What should I do? The modified 4g module card should be the same as the mobile phone card. You can add a universal 4g card. It is the most cost-effective boot mode. You can't change it without a card slot, so you can't add it.