HIDDEN SECRET CODES FOR ANDROID SMARTPHONES,ANDROID USEFUL CODES, ANDROID ON SCREEN CODES,

•                 *#06# – Displays IMEI

•                  *3001#12345#* + “Call” – Accesses a hidden Field Test menu

•                  *#43# + “Call” – Displays call waiting status

•                 *43# + “Call” – Enables call waiting

•                  #43# + “Call” – Disables call waiting

•                 *#21# – Displays call forwarding status

•                 ##002# + “Call” – Disables all call forwarding

•                  *33*pin# – Enables call barring

•                 #33*pin# – Disables call barring

•                  #31#phone-number + “Call” – Blocks caller ID for the current phone call

•                  *3370# + “Call” – Enables “Enhanced Full Rate” and improves voice quality on GSM          networks (may impact battery life)

•                 *#5005*7672# + “Call” – Displays your carrier’s message center phone number 

•                 *#*#4636#*#* – Accesses a hidden test menu with sections for network, battery information and usage stats. Under the “About phone” option in Settings, tap “Build number” seven times – this will enable a new “Developer options” menu in Settings that gives you access to a treasure trove of functions