Copy the code of the mobile phone that is known to support MHL function, see the figure below (Also can search by Baidu): 
Test MHL's mobile phone:
Samsung 9300 
Prepare a universal version of the MHL to HDMI cable. (Note: The universal version is suitable for any mobile phone that supports MHL function) 
Insert the HDMI plug and USB plug of the data cable into the X50air's corresponding interfaces. 
The HDMI plug and the USB plug of the MHL cable are plugged into the corresponding X50air interface. 
Insert the USB plug of the MHL data line phone into the phone's USB port. (Note: The phone does not need any settings, as long as it supports MHL.) 
Switch the X50air to the HDMI3 source and set the image ratio to: Point to point (Menu ---Image Scale --- Point to Point) 
MHL has been connected. At this time, the image on the mobile phone has been on the same screen as X50air. 
After connecting the MHL, we can play music on the X50air on the same screen mobile phone. 
After connecting MHL, we can also play games on the screen with X50air.
Use the MHL to HDMI data cable to synchronize the mobile content to X50air!
Use help: 1). Connect the USB cable to the USB port of the TV projection, or an external power supply (5V 1A). 2). After connecting the MHL line, if there is no picture. The first time you must use the MHL line to plug in the phone to restart the phone, otherwise there is no HDMI output. Automatically output after restarting the phone. 3) After the MHL cable is connected, the HDMI logo will be displayed on the phone (some phones will not display). The phone will show charging. 4). MHL is universal! (as long as your phone supports MHL protocol). 5). Mobile phones may not support MHL output if they have been swiped ROM.