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California has dense 5G and 4G LTE coverage across its major metro areas, with T-Mobile, AT&T, and Verizon all providing strong networks throughout the state. Los Angeles and the greater LA metro area including Hollywood, Santa Monica, Venice Beach, Pasadena, and Long Beach have full 5G from all three carriers. San Francisco's downtown, the Financial District, Union Square, Fisherman's Wharf, and the Mission District have dense 5G. The Bay Area tech corridor along Highway 101 and I-280 from San Francisco to San Jose and Silicon Valley has saturation-level 5G coverage. San Diego, including the Gaslamp Quarter, Balboa Park, and La Jolla, has strong 4G and 5G. Sacramento's downtown and capitol district have solid 4G and 5G. Palm Springs and the Coachella Valley have 4G and 5G in the main resort and downtown areas. Highway 1 through Big Sur is one of the longest stretches of road in the US with no reliable cell service. Signal is absent for approximately 90 miles between Carmel and San Luis Obispo. Yosemite Valley has limited 4G at the main visitor areas but no service on most trails, at Half Dome, or in the backcountry. Joshua Tree National Park has no reliable service inside the park boundaries. Lake Tahoe has 4G at the main resort areas on both the California and Nevada sides. The Napa Valley wine country has good 4G along Highway 29 through Napa, Yountville, Oakville, and St. Helena. Highway 395 on the eastern Sierra corridor has 4G in towns like Bishop and Lone Pine but gaps between.