NBC app now streams live network programming to iOS and Android users in certain cities
We need to point out that similar to the NBC website, live streaming is only available in those areas where the local NBC affiliate is owned by NBC itself. For example, in New York, WNBC is what is known in the trade as an "O&O" which means that NBC owns and operates the local station. The list of cities where the NBC app will provide live streaming includes New York, L.A., Chicago, Philadelphia, Dallas-Fort Worth, the San Francisco Bay Area, Boston, Washington, D.C., and Miami-Fort Lauderdale. In addition, you must subscribe to a participating cable provider and verify that you do have an account.
The update also expands the library of classic NBC shows available for you to view on-demand such as The A-Team, Miami Vice, Kojak, Battlestar Galactica, The Incredible Hulk, Knight Rider and more. The NBC app is a free download from both the Apple App Store and the Google Play Store.
source: NBC (iOS|Android)