By having your cell number, a scammer could trick caller ID systems and get into your financial accounts or call financial institutions that use your phone number to identify you. Once the scammer convinces your carrier to port out your number, you may never get it back.

What can a scammer do with name address and phone number?

With a name and address, a thief can change your address via U.S. Postal Service and redirect mail to their address of choice, Velasquez says. With access to your financial mail, the thief may intercept bank statements and credit card offers or bills, then order new checks and credit cards.