Unknown Number (2019) is a Mystery, Crime, Sci-Fi & Fantasy series that follows through a mysterious Motorola phone, two detectives - one from the present, and the other from 15 years in the past - begin communicating and working together to solve cold cases. Unknown Number is not currently listed with streaming providers in your selected region, but availability can change over time. It has a user rating of 7.0 out of 10 from 1 votes. Fans of mystery series may also want to explore similar titles below.