In order to use all these Android Secret Codes you just need to simply open the Dialer of your smartphone and type the secret code of which ever function you need to perform out of all these and you are good to go.

Here Is the list of  20 Android Secret Codes for your Smartphone :-

Phone Information, Usage and Battery – *#*#4636#*#*

IMEI Number – *#06#

Enter Service Menu On Newer Phones – *#0*#

Detailed Camera Information – *#*#34971539#*#*

Backup All Media Files – *#*#273282*255*663282*#*#*

Wireless LAN Test – *#*#232339#*#*

Enable Test Mode for Service – *#*#197328640#*#*

Back-light Test – *#*#0842#*#*

Test the Touchscreen – *#*#2664#*#*

Vibration Test – *#*#0842#*#*

FTA Software Version – *#*#1111#*#*

Complete Software and Hardware Info – *#12580*369#

Diagnostic Configuration – *#9090#

USB Logging Control – *#872564#

System Dump Mode – *#9900#

HSDPA/HSUPA Control Menu – *#301279#

View Phone Lock Status – *#7465625#

Reset the Data Partition to Factory State – *#*#7780#*#*

Format Your Device To Factory State(will delete everything on your phone) – *2767*3855#

Hidden Service Menu For Motorola Droid – ##7764726