What causes a phonecall to be deisgnated "Blocked"?

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12GA

macrumors member
Occassionally my 1st gen iPhone will receive a phone call and the display will read "Blocked" instead of a telephone number.

Is this the result of the caller having done something to block identification of their number, or some feature of ATT? :confused:
 
Blocked/restricted means that the caller does not want his/her phone number shown on caller ID, and has disabled that feature.
 
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