Regional statistics: San Diego, California has a population of 1287050 that is in a county of 994677 units. The city is in a county that is 4204 square miles. 858-541 is available through the regional telephone switch # SNDGCA03DS0 in the San Diego area.
I received a call from this number at 10:44 pm EDT to my cell phone. The caller hung up just before I was able to answer the call. When I called back, their phone rang once then went to some sort of odd signal similar to the sirens used on European police cars.