Check your bills and bank statements: for any unauthorized charges or withdrawals and report them immediately.
Stop pre-approved credit offers: they make a tempting target for identity thieves who steal your mail. Remove your name from credit bureau marketing lists by visiting https://www.optoutprescreen.com/ or calling 1-888-5OPTOUT.
Ask questions: whenever you are asked for personal information that seems inappropriate for the transaction, ask how the information will be used, if it will be shared and how it will be protected. Not satisfied with the answers? Do business elsewhere.