T-Mobile, AT&T, and Verizon all deploy 5G in Los Angeles. Verizon 5G Ultra Wideband covers Downtown LA, Hollywood, Century City, Santa Monica, and along key corridors of the 405 and 101 freeways.
Hollywood Blvd, the Walk of Fame, Beverly Hills' Rodeo Drive, the Santa Monica Pier, and Venice Boardwalk all have strong outdoor signal. Koreatown, Echo Park, Silver Lake, and Los Feliz have solid 4G. The Metro Rail system's above-ground lines have 4G coverage throughout.
Underground sections of the Metro B (Red) Line in Hollywood and Downtown have partial coverage at stations. Malibu's Pacific Coast Highway has 4G at the main beach towns but can have gaps on the more remote canyon sections. Griffith Park trails can lose signal in the canyons and forested sections.
LAX airport has full coverage across all nine terminals.