How to find hidden service test menu for Samsung galaxy S6, S5, S4, A7, A5, A3

crwdns2936025:01crwdne2936025:0 —

crwdns2935483:0crwdne2935483:0

From the dialer app enter this code:
*#7353#
Now you can check the Light and Proximity sensors, Accelerometer, Touch screen, Main Camera and so on.

crwdns2944171:0crwdnd2944171:0crwdnd2944171:0crwdnd2944171:0crwdne2944171:0

crwdns2935431:0crwdne2935431:0