Dial a caller ID block code before the phone number: If you are living in the United States dial *67 before dialing the actual phone number, if you live in the United Kingdom dial 141 to block you Caller-ID number and/or name from being displayed on someone else's caller identification device. So for instance, if you want to call 218-333-222, Dial *67-218-333-222 instead. Your caller will see a message which says "caller ID blocked". If you have blocked your Caller-ID permanently for a specific number, dial *82 before dialing the number (in US).
This service only applies to every individual phone call. Block you Caller-ID in all your outgoing calls by default by applying for this service from your phone company. Dial your phone company and have them add the Caller-ID block service to your line. Remember that phone companies are permitted to charge for this service. Some mobile phone companies allow you to call a person through voicemail.
Simply listen for a call option, and then dial the number. Because the call is via the voicemail system, you are basically calling through their phone line, and it appears as a blocked Caller-ID. This method is significantly cheaper compared to the previous method, as it only uses minutes from your plan, which would normally be spent. Toll-Free Numbers: When you make a toll free call, or call emergency services like police ,ambulance, etc the recipient might be able to identify your number using a system called Automatic Number Identification (ANI) even if you have enabled the caller-ID block service; These companies are forbidden to use or give out the phone number, so there is not much of a problem regarding privacy; These companies are also required to inform you that your phone number has been transmitted to them.
John Cicero has written articles on Caller ID Block, Caller ID Blocking and Caller ID for The Tech FAQ.
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