Frequent visitors of Leicester Square, Oxford Street and the Tube should check their pockets—they may be in for a pleasant surprise.

A British telecom firm, the TalkTalk Company, has enlisted 20 former pickpockets for an unusual promotional campaign. Wandering the streets, the “put-pockets,” as they are coyly named slyly put money into the pockets of unsuspecting citizens along with a business card for the firm. The company will be giving away more than $150,000 during the campaign.