Where does the built-in 4G network in cars come from?
2 Answers
The built-in 4G network in cars is similar to that in mobile phones, both requiring a SIM card, and the data usage is managed through the bound SIM card. 1. Data Usage Explanation: Generally, the connected car data is divided into two parts: basic functions and entertainment functions. Basic functions come with lifetime free data. If the built-in data in the car runs out, only the entertainment functions become unavailable. Basic functions can still be used, such as driving navigation, real-time traffic updates, remote car control, and in-depth voice services. 2. SIM Cards Are Not Interchangeable: Although both car data and mobile phone data are used through bound SIM cards, the SIM card for cars is specially designed and built into the multifunctional car system, making it completely invisible. Even if you insert a mobile phone SIM card into the multifunctional car system, it will not be recognized. Therefore, it is impossible to use a mobile phone SIM card in the car.
I previously helped a friend with an upgrade for their vehicle's internet connectivity. The in-car 4G network is actually provided by a built-in IoT card, essentially meaning the car comes with its own SIM card. Automakers install the communication module before the vehicle leaves the factory, connecting it to cellular networks from major carriers like China Mobile or China Unicom. Unlike a phone SIM card, this one can't be removed, as it's often soldered directly onto the motherboard. It's handy for checking real-time traffic and updating navigation, but remember to check the data plan—many new cars come with free service for the first two years, after which you'll need to renew. If the signal suddenly worsens, it might be due to local base station coverage issues; try rebooting the car's infotainment system.
