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You can block a phone number or contact on Android from the Phone app, your contacts list, recent calls log, and more. Here's how to do it.
Caller ID blocking is the common term for a service by which a caller can prevent the display of the calling number on the recipient's telephone. Blocking the number is formally referred to as calling line identification restriction (CLIR).
These devices rely on caller ID information and thus a phone blocker requires a caller ID service active on the line for blocking to function. Treatment of blocked calls may include: Sending the caller to voicemail; Sending the caller to busy signal; Sending the caller to "Number No Longer in Service" Sending the caller to "Keep Ringing"
Australia: 1831 on landlines and mobile phones, or #31# from a mobile [5] United Kingdom, Ireland, Isle of Man, and Channel Islands: 141 on landlines and #31# on mobiles; United States: *67; Sweden: #31# Conversely, to send the caller number on a line where the number is normally withheld, the following prefixes can be dialed:
183x – Caller identification override prefixes (1831 blocks caller-id sending while 1832 unblocks caller-id sending) 188 xxxx – Premium SMS (since moved to 19 range) 189 xx – Calling card service; 19 xx xx and 19xx xxxx – Premium SMS; 190x xxx xxx – Premium rate services (usually 1902 and 1900) Some notes:
Block all senders except for Contacts Avoid the frustration of unwanted emails by enabling the option to only receive messages from senders who are in your contact list. If you're expecting messages from a specific sender, be sure to add their email address to Contacts .
If Caller ID is subscribed to or enabled on the line receiving the call, the unblocked phone number and registered name is displayed – unable to determine that the caller subscribes to outgoing callerID blocking or that *82 has been dialed to temporarily override that subscription. *82 can be dialed from U.S. land-line house phones and ...
Automatic number identification (ANI) [1] [2] is a feature of a telecommunications network for automatically determining the origination telephone number on toll calls for billing purposes. Automatic number identification was originally created by the American Telephone and Telegraph Company (AT&T) for long distance service in the Bell System ...