Use the Self-Registration Portal to add cell phones to your actual address. The system will not accept Post Office boxes; it must be a real street address. 

If you have conventional land-line service to your home or office, even if it is unlisted, your number is automatically in the Reverse 911 database.

Perhaps - if your system simply requires a valid Caller ID, our Reverse 911 call will get through. However, in the event of a natural disaster or other emergency, you should disable your blocking. 

The system is geographically-based. Use the Self Registration Portal to increase your chances of being notified properly. 

If you have problems with registration you can email Reverse 911 ([email protected]).

Note: Reverse 911 is simply another tool to assist you in an emergency, but with any system, it may not be 100% effective. Please make sure you monitor the local Emergency Alert System provided by television and radio stations, while also checking the County of San Luis Obispo Office of Emergency Services website for additional information during fires or other natural disasters. 

If you have digital or internet telephone service, check with your phone provider to see if they are "E911 Compliant" and that your account information is correct.

No, your number will only be used to communicate official messages.