Your phone number can be used by adversaries to unlock your personal data. With just your phone number, they can identify current and previous addresses, your birthdate, and personal financial information. They can steal your identity and take over online accounts. Through text-based schemes, they can attempt to compromise your device with malware or impersonate your bank, the IRS, or other trusted institutions to extract sensitive information. Exercise caution when answering calls or clicking links in messages from unknown numbers.