No Mobile Phones Allowed Sign - Visual Warning Symbol #2216531 (License: Personal Use)

The image features a high-contrast red square background with a black silhouette of an older-style mobile phone crossed out by a diagonal red slash-forming a standard prohibition symbol. The design follows ISO safety signage conventions, ensuring immediate recognition across cultures and languages. It’s commonly used where electronic devices pose risks to safety, privacy, or concentration.

Used on signage in hospitals, exam rooms, government buildings, theaters, and secure facilities to enforce digital silence or prevent signal interference. Matches user intent for finding clear visual warnings or printable safety symbols.