tech4google

Here is the only one secret code I had found for Sony Xperia Z: *#*#7378423#*#* But here are some secret codes for Generic Android which will might work on Sony device : *#*#4636#*#* – Phone Information (allows you to change the SMS service centre number and more) *2767*3855# – Factory Reset Phone *#*#34971539#*#* – Shows completes information about the camera *#*#7594#*#* – Changing the power button behavior  *#*#273283*255*663282*#*#* – For a quick backup to all your media files *#*#197328640#*#* – Enabling test mode for service activity *#*#232339#*#* or *#*#526#*#* or *#*#528#*#* – Wireless LAN Tests *#*#232338#*#* – Displays Wi-Fi Mac-address *#*#1472365#*#* – For a quick GPS test *#*#1575#*#* – A Different type GPS test *#*#0283#*#* – Packet Loopback test *#*#0*#*#* – LCD display test *#*#0673#*#* or *#*#0289#*#* – Audio test *#*#0842#*#* – Vibration and Backlight test *#*#2663#*#* – Displays touch-screen version *#*#2664#*#* – Touch-Screen test *#*#0588#*#

Here are the two secret codes for Huawei Sonic (U8650) and will also work for the similar Huawei devices. These two codes would be enough as it opens many service options and phone information. Code for the service menu: *#*# 2846579 #*#* Code for the info on your phone: *#*# 4636 #*#*