On Tuesday, Cingular launched its Cingular Video on-demand streaming video service, allowing users to view video clips of various types of content, including television shows and movies, on 3G-capable Cingular mobile phones. Cingular’s 3G phones go for $99 with a two-year service contract, after a $50 rebate, according to MobileTechReview, and users must purchase a $19.99 Media Net Unlimited data package to use Cingular Video. Premium content like HBO will be available by monthly subscription.