Caller ID / Call Display
If you wish to either show or hide your phone number on outgoing calls then you may either set this on your phone's menu or manually enter the code before dialing. These codes will override whatever menu setting you have on a per-call basis.
Do not display: #31#[phone number]
Display: *31#[phone number]
Status: *#31#
North American GSM service providers also support the landline codes for this feature (these also work on CDMA, TDMA, and iDEN phones):
Do not display: *67[phone number]
Display: *82[phone number]
There are also codes to show or prevent incoming numbers from being shown on your handset if you subscribe to this feature. I'm not too sure why you'd want to do this, but just in case you do:
Do not display: #30#
Display: *30#
Status: *#30#
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