Caller ID Unblocked sends telephone number information along with the call. The person you call, assuming they have the proper equipment, can see your telephone number. Conversely, users that select Caller ID Unblocked may wish to block identifying information on certain calls. For example, individual faculty members or physicians calling students or patients may not want their private office telephone numbers made public, as they do not want calls coming back to that number. As noted above, both Blocked and Unblocked include a feature access code that lets you override the setting for a particular call.
Settings are available on a per line basis.
This means that anyone with more than one telephone line on a phone can choose either option for each individual telephone line. There is no monthly fee charged for either outgoing Caller ID option.