Verizon Communications Inc will launch a trial version of its new mobile video service on Tuesday, aiming to prove that telecom players can compete with mobile ad industry titans Google Inc and Facebook Inc. Verizon said its service, a mobile app dubbed "go90", will be offered initially to a select set of its own customers, with advertisements from well-known brands, which it declined to name, but without newly acquired ad technology from AOL, the media company it bought in June for $4.4 billion. Verizon is targeting young viewers or millennials with about 100 to 200 hours of exclusive content from online video networks such as AwesomenessTV and Machinima, said Brian Angiolet, Verizon's senior vice president, consumer products.