How to Block a Phone Number Permanently?
‘Line block’ is the simplest measure to block mobile phone number permanently. You can call the customer care of your service provider, and tell them that you want to avail the line block facility. The customer care representative will ask you a few questions, such as your address or date of birth, to confirm your identity. Then the service provider will do the needful to block your cell phone number. On doing this your cell phone number will not be displayed on the receivers caller ID. Suppose you are availing the facility of line block, but you want the person on the other side to know that you are calling only for one specific call, then you can dial *82 before dialing the number you are calling. The downside of this facility, though, is that many users block calls from cell phone users availing the line block facility.

How to Block a Phone Number Temporarily?
At times blocking cell phone number temporarily is much more convenient than blocking it permanently. Blocking the number temporarily will mean that your number will not appear on the receivers caller ID for that specific call. In order to block cell phone numbers temporarily, you have to dial *67 before the number you are calling. The service, however, doesn’t have the feedback facility wherein you will come to know whether the service worked. And hence, it is recommended that you try using this facility either on your home phone or your friends cell before you put it to use.

Knowing how to block a cell phone number is of great help, especially when it comes to privacy issues. Other than all the carriers, even some cell phone manufacturers provide this service in their menu. Remember that blocking your cell phone number doesn’t work, when it comes to emergency numbers or call tracing by the law enforcement agencies. And hence, you need to make sure that you block cell phone number only for some genuine reason. If used for fraudulent means, your phones can be easily traced and you may find yourself in deep trouble.