Blocking Unwanted Calls I Phone

What is the code number for blocking unwanted calls to my iPhone. ??

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AT&T Wireless Knowledge Base Results

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Answer Center | AT&T
... Certain Numbers AT&T Tilt Keypad Layout IMPORTANT: Enabling dialing restrictions can cause permanent damage to the SIM card. A PUK2 code will be displayed. Entering the incorrect PUK2 code more than 10 times can cause the inability to place or receive calls from the phone. It is off From the standby screen...
Answer Center | AT&T
... enter this solution. Services tab. A PUK2 code will be displayed. If the device asks for the AT&T Tilt Symptom Unable to Place or Receive Calls from the phone. Tap Phone Menu Tap Highlight "Call Barring", tap Get Settings Under "Block incoming calls" and "Block outgoing calls" select Off ok when complete. Saturday, September 4, 2010...
Answer Center | AT&T
... (Star Services) Symptom Placing calls Blocked Numbers Use a correct dialing pattern Domestic dial the 10-digit area code and number without the one or zero (example 407-555-1212) dial the 11-digit one + area code + number (example 1-407-555-1212) dial the number without the one or zero or area code, just the 7-digit number (still used in *Services...