Dont give out your phone number online. Unless you trust a person, dont give them your number, even if you bought something from them. If you must share it, do it privately (via email or a direct message) and not on a public message board.

What can someone do with your phone number online?

Yes. Your phone number is out there on the web in various locations. Scammers can use stolen cell phone numbers and use it for two-factor authentication codes and other access to all your texts, apps, and other online accounts, they could have your cell phone number hijacked and do it through SIM swapping.

What can someone do with your number?

Access. Once hackers gain control of a phone number, they can then access their online profiles – on Facebook, Twitter, Gmail and WhatsApp – which are all usually linked to the mobile number. All they need to do is ask the social media companies to send a temporary login code, via text message, to the victims phone.

Is it bad to give your phone number out?

Some of this information may seem innocent enough, but in the wrong hands, it can expose you to criminal activity. Hackers, identity thieves, and scammers can use your phone number to find out where you are (and where youll be), impersonate you, hijack your phone, or use your accounts.