What does mobile phone file at mean?

AT usually means "at", but in mobile phone files, AT usually refers to the abbreviation of Access Technology. It is one of the important protocols for communication between mobile devices and base stations, and is the basis for ensuring that mobile devices can stably connect and communicate with mobile networks. Therefore, when we see the abbreviation AT in mobile phone documents, we should know that it does not mean "in", but a technical term related to mobile communications.

In some cases, at can also mean "at? time". For example, in the mobile phone folder, we may see some folders whose names start with at. For example, "at home" means "at home". This naming method is usually used to help users classify and manage their files more conveniently, such as dividing their photos into "at home" and "at work", which represent photos taken at home and at work respectively.

In mobile phone files, AT can also refer to "AT command", which is a command language used to interact with mobile networks. AT commands are usually used to command modems, SMS modules and other devices to operate, and can be sent to devices through serial ports, Bluetooth or Wi-Fi. AT commands are very common in mobile phone development and testing because they can help developers control devices and test mobile network-related functions more conveniently.