Think carefully about who you give your mobile phone number out to. It’s a long time since your phone number was solely tied to the address you lived at (which you should also be careful about sharing with nosy websites and apps). A huge amount of your life is attached to your phone number. Once someone has your phone number they can use it to access many other pieces of information about you. For fun, try a web search for your number. You may be surprised at the results.