You can call 911 toll-free from any public telephone to obtain police, fire or medical assistance. Emergency services can detect your location from a landline; if you call 911 on a cell phone, be prepared to give your location to the operator.
Dos & Don'ts
Do be aware that California has 25 separate area codes (and they seem to change faster than the traffic lights).
Don't panic if you feel an earth tremor, but do take action if there is time: If you're indoors, stand in a strong doorway or get underneath a sturdy desk or table away from any windows—and watch out for falling objects. Do not go outside, and under no circumstances should you get in an elevator. If you're outdoors and you feel a tremor, move into an open area, away from buildings, trees, brick walls or power lines. If you're driving, pull over and stop away from overpasses and power lines, and stay in your car until the shaking has ceased. Remember, not every shake is a life-or-death situation. Though California is famous for earthquakes, most residents have felt fewer than three tremors in their lifetime. In fact, few have experienced a big earthquake. Generally speaking, you won't realize you've experienced an earthquake until it has passed, if you experience one at all.
Do be aware that park rangers at Yosemite will fine you if you leave food in your car and a bear breaks into the vehicle to get to it.
Do be aware that the legal drinking age in California is 21, and you must be 18 to purchase tobacco products.
Don't be surprised if upon entering California, your car is inspected more closely than if you were crossing the border into Mexico. Any produce or plants may be confiscated—the state's Department of Food and Agriculture administers strict quarantines.
Do keep in mind, if you cross the border into Mexico, U.S. citizens may be asked to show proof of citizenship. For longer stays or trips south of Ensenada, you'll need a tourist card, available from the Mexican Embassy. U.S. insurance is typically not valid in Mexico, but short-term insurance is available for purchase near the border.
