Block a cell phone number when making a call by entering *67 before dialing the 10-digit phone number. Learn how blocked cell numbers will show up on a caller ID as private or blocked numbers with information from the manager of a cell phone store in this free video on cell phones. Expert: Geordie Andulakis Bio: Geordie Andurlakis is the store manager at an AT&T Spring cell phone store. Filmmaker: Clay Roberts