What is the source of the built-in 4G network in cars?

[LaJulianna]

The built-in 4G network in cars comes from a SIM card bound to the vehicle. Here is a detailed introduction about the built-in data: Classification and top-up of built-in 4G data: Generally, the connected car data is divided into two parts: basic functions and entertainment functions. The basic functions come with lifetime free data, while the entertainment functions require users to top up through the car's exclusive APP after the data is used up. Cannot be replaced with a mobile phone SIM card: Although both car data and mobile phone data are used through bound SIM cards, the car's SIM card is specially made and built into the multifunctional car system, making it usually impossible to replace. Even if forcibly inserted into the car system, it cannot be recognized and used.