AT&T’s newly announced Watch TV, a low-cast live TV streaming service announced in the wake of the AT&T / Time Warner merger, is now up and running. The company already has one over-the-top streaming service with DirecTV Now, but this one is cheaper, has some restrictions, and doesn’t include local channels or sports to keep costs down. At $15 per month, the service undercuts the existing low-cost leader Philo by a dollar, but offers a different lineup ( Fomopop has a nice channel-by-channel comparison between the two, if you’re in the market.) Both have 25 of the same channels in their packages, including A&E, AMC, Comedy Central, Food Network, Discovery, HGTV, History and others, but AT&T Watch is missing MTV, Nickelodeon, and Travl Channel. In total, Watch TV has over 30 live TV channels, plus 15,000+ TV shows and movies on demand, and allows you to subscribe by way of updated AT&T Wireless plans . Non-AT&T customers can subscribe for $15 per month...