You can request a one year fraud alert by calling one of the three credit bureaus. The alert expires after one year. If you want to maintain the alert, you will need to call every year to submit a new request. The credit bureau you call should alert the other two to your request, so you should only need to make one call per year.
The fraud alert phone numbers for the credit bureaus are as follows:
You can also file a 7-year alert by mailing a copy of a police report to the credit bureaus.