Many mobile phones and tablets now support OTG. What is the function of OTG? What is an OTG data cable? In fact, OTG is the interface for data transmission between mobile devices. In short, you can connect your phone or tablet to a USB device via an OTG cable (such as a USB flash drive or a 3G network card).
1. What is an OTG line?
To understand what the OTG series is, we first need to understand the function of OTG on mobile phones or other mobile devices.
OTG is mainly used for connection between various devices or mobile devices for data exchange. The development of USB technology enables computers and peripheral mobile devices to transmit a variety of data over a simple USB connection. But once without a computer, we will not be able to manage the mobile devices, such as mobile phones and tablet PC, which can be inconvenient for users. As mobile devices such as mobile phones become closer and closer as computers, can we imagine using a mobile phone as a computer? You can also connect a USB flash drive, USB network card, etc. on your phone. The answer is yes. The OTG is implemented to enable a mobile phone to be connected to a USB device, such as a USB flash drive. However, the phone is a small USB interface that cannot meet the requirements of the USB interface, such as a USB flash drive. At this point, the OTG data line appears.
2. OTG is to enable data transfer between mobile devices without a computer. The OTG line allows you to connect devices directly for data transfer and printing operations, rather than a single line connection to two mobile devices. There is no need to carry a memory card or computer for transmission. The most common thing is that mobile phones connect USB devices (such as USB flash drives) through OTG cables to extend mobile device functionality.
3.  OTG data line classification
In general, there are two types of OTG lines. One requires a power connection and the other does not require a power supply, but they have the same function and are usually used as external devices such as printers that connect to a USB and equipment such as cameras. For example, if our phone supports OTG, what if we want to play movies or music on a USB flash drive? Ordinary users can only transfer files on the U disk to the mobile phone through the computer, but as long as the OTG data cable is used, we can directly open the files on the U disk of the mobile phone.

4.  For example the tablet we generally buy only support Wifi wireless Internet, but if you want to achieve 3G wireless Internet, what should you do? In fact, it is very simple. As long as our tablet supports OTG, the tablet can be connected to the USB 3G NIC via the OTG cable. This will enable the tablet to achieve 3G wireless Internet access.

5. In general, an OTG line refers to an OTG data line. Its function is to implement a direct connection between mobile devices outside the computer. It is very popular and practical for today's smartphones and tablets. With the OTG cable, you can connect your phone directly to a USB flash drive or other USB device, which is the best bridge for users.