- *#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