*#06# - Displays your International Mobile Equipment Identity (or IMEI for short). The IMEI number is used by the GSM network to identify valid devices and therefore can be used to stop a stolen phone from accessing the network.
*#21# and press Call. Settings for call forwarding for calls, data, fax and sms.
*#30# and press Call. Calling line presentation check.
*31# (followed by the number you are dialing) - Sets outgoing "Caller ID" to be private.
#31# (followed by the number you are dialing) - Sets outgoing "Caller ID" to be visible.
*#31# (followed by the number you are dialing) - Displays current setting of outgoing "Caller ID". (Disabled = visible, Enabled = private).
*#33# and press Call. Check for call all barring.
*#43# and press Call. Determine if call waiting is enabled.
*#61# and press Call. Check the number for unanswered calls. Shows the number for voice call forwarding when a call is unanswered. Also shows the options for data, fax, sms, sync, async, packet access and pad access.
*#76# and press Call. Check whether the connected line presentation is enabled or not.
Source: Hack That Phone
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