Where does the built-in 4G network in cars come from?

[McLeilani]

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.

[McBryce]

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.

[MiguelLee]

The 4G network in my car has been in use for three years. Simply put, the car manufacturer built in a dedicated communication module at the factory. It receives signals through the shark fin antenna on the roof, using networks from operators like China Mobile or China Telecom. Unlike mobile hotspots, this built-in network is more stable and is used for remote air conditioning activation or OTA updates for the car's system. In terms of data plans, I recommend opting for an annual package, which is more cost-effective than monthly payments. If the network suddenly stops working, it might be due to the plan expiring or nearby signal tower maintenance. Nowadays, many underground parking garages have poor signal coverage, which is something that can't be completely avoided.

[KennedyAnn]

The in-car 4G is essentially a communication module pre-installed by the manufacturer on the assembly line, operating similarly to a built-in SIM card in a smartphone. It receives cellular signals from the three major carriers via the roof antenna, enabling the vehicle's infotainment system to connect to the internet. Compared to external mobile Wi-Fi devices, this built-in solution offers better interference resistance, making voice-controlled navigation particularly accurate. When I first bought the car, I enjoyed three years of free service, but now the annual fee is over 600 yuan. The most practical features are remote vehicle location tracking and tire pressure monitoring. Remember to regularly update the network protocols in the vehicle's settings.