An undercover Salt Lake police officer called a number he found on a public restroom wall Wednesday and later arrested a man for soliciting sex.

The officer found a number on a restroom wall in a downtown mall that advertised sex acts for sale. So he called the number and made a "date" with a male homosexual prostitute, agreeing to meet him in the area of Second North and Second West, according to a police report.The police officer met the man, 21, and issued him a misdemeanor citation charging him with soliciting sex, the report said.