Sometimes you may receive a call that your smartphone display or landline caller Id shows as zero. Though this is very uncommon, it is not always a sinister caller but somebody who has opted not to list his/her telephone number by paying a premium to the telephone company. How would you like to get the very same feature on your smartphone/landline without paying your telephone company. Or maybe you want to surprise your friend! Whatever be the reason, here’s how to stop your number flashing up on the display of the person you’re calling. Now that’s out of the way, here are all the ways to hide your number when making a phone call from a landline or mobile. (The methodology is the same across all networks.) You can also anonymise your number through your phone’s settings which controls the sending of caller ID. Here’s how it’s done.