Caller ID is a feature that allows the person receiving a call to see where a call is coming from before answering the phone. For privacy purposes, however, someone placing a phone call can choose to block the transmission of their caller ID information. Calls placed from blocked numbers don’t show up on the call recipient’s caller ID display. But just as callers have the right to block their caller ID information, call recipients can reject calls from blocked numbers. You can use AT&T’s Anonymous Call Rejection feature or Privacy Manager to force blocked callers to identify themselves before getting through. Tips Writer Bio
