The only trouble with this is that so many companies are using the cell phone to send messages. This has become a real nuisance for people trying to conduct business in a normal way and it costs the receiver as well. (My daughter has a number that someone else had and she gets 15 or more of these messages per day) Basically spam of the mobile phone is my biggest worry about anyone knowing my number. If there was some way to block this feature it would be nice.

The people who want you call them on their cell phone would have already provided you with their numbers. Publishing it openly would be equivalent to listing your e-mail in an open directory, inviting all kinds of unsolicited spam.

Because cell phones are a pay by minute service there is a great libialty to haveing your number published, for you and your service provider, if they publish you number and telemarketers burn up all your minutes the service provider is lining their own pockets at your expense and can be held liable. hence legal issues restrict service providers from publishing a phone book not an attempt to block compeditors, actually any cell phone company can lookup anyones cell phone number through a network that is only avalible to service providers, they just cant release the information to the public.