Excerpt from this article:
The reason for the tech-free dinner? The cellphones were stashed in a small decorative box on their table, an initiative that Marco Canora, Hearth’s chef and owner, began in November to help customers disconnect from their devices for a little bit.
Some restaurants, partly from irritation when patrons take pictures of the food, place limits on cellphones in their dining rooms. Others, including in Chicago and San Antonio, have banned them entirely.