Caller ID is great to have, but there are certain situations where you don't want the person you're calling to have your number. Luckily, whether you're using an iPhone, Android, or even an old flip phone or landline, there are a few ways to disable outgoing Caller ID to block your number from appearing.
2.Blocking Your Number on Android:
there's an app for that. Hide Caller ID ($1.09) lets you block all calls or set up black and white lists for specific contacts.
there's an app called It's Me ($1.99) that lets you choose whether or not to show your number for each individual contact.
People who sometimes use their personal phones for work may not want clients knowing where to reach them outside of work, and anytime you're dealing with Craigslist, it's better to be safe than sorry.Check these apps in google play and apple store