The communication used at present is geometrically shaped and the cells are connected in a hexagonal shape. Therefore, the current communication is also called cellular mobile communication. It is a cellular wireless networking method that passes between the terminal and the network device. The wireless channels are connected so that users can communicate with each other during activities. Its main feature is the mobility of the terminal, and it has the function of handoff and automatic roaming across the local network. The cellular network consists of the following three parts: mobile station, base station subsystem, and network subsystem. A mobile station is a network terminal device, such as a mobile phone or some cellular industrial control device. The base station subsystem includes a mobile base station (large tower), a wireless transceiver device, a private network (generally a fiber optic), a wireless digital device, and the like. The base station subsystem can be seen as a converter between the wireless network and the wired network.
The 4g network is a kind of cellular mobile network. The cellular mobile communication service refers to services such as voice, data and video images provided by the cellular mobile communication network composed of devices such as the base station subsystem and the mobile switching subsystem. Therefore, cellular mobile data is data generated in cellular mobile communications. That is what we usually say about data traffic. There is such a switch on the Apple mobile phone, in fact, it is the switch of the traffic. When it is turned on, it can use the traffic to access the Internet. After it is turned off, it can no longer access the Internet through mobile data traffic. The cellular mobile communication network generally refers to the public mobile communication network adopting the cellular network structure. From the commonly known 1G (first generation mobile communication network) to the current 4G, it can be regarded as a cellular mobile communication network. However, in reality, because of the uneven distribution of terrain and users, the planning of network construction and station construction, the selection of real site and the iteration of each generation of technology (such as from GSM inter-frequency networking to the current 3G and LTE co-frequency networking) ) For various reasons, our current 2G, 3G, and LTE networks are no longer a "cellular" network in the strict sense, at least not like "cellular". However, it is estimated that it has been called habit or commemoration, so the cellular network has been used to refer to the public mobile communication network.
Follow the instructions below to get help with troubleshooting cellular mobile data issues on your iPhone. Test each step after each step to confirm that the problem has been resolved.
Turn off cellular mobile data on your iPhone and turn it on again: Tap Settings > General Mobile Mobile Network.
Restart the iPhone.
Check if there is an operator setting update.
Update the iPhone.
Remove the SIM card and reinsert it. Allow the iPhone to regain network access.
If your SIM card has SIM card PIN enabled, try turning it off: Tap Settings > Phone > SIM PIN.
Try another location. If you switch to another location to resolve the issue, but there is still a problem in the original location, please contact your carrier to report the issue.
Restore network settings: Tap Settings > General Restore to restore network settings.
Restore your iPhone to a new device.
Contact the carrier to verify that the iPhone has been properly set up for the account based on the current data plan. If you are traveling abroad, you may need to turn on data roaming: Tap Settings > General Mobile Mobile Network. Please contact your carrier first to find out about the cost of international data roaming. Also, see this article.
Note: If the carrier does not appear in this list, please confirm with the carrier that the correct cellular mobile data settings are being used.
If none of the above steps resolve the issue, please contact the carrier for resolution.
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