I have AT&T phones and DirectTV and watch live tv from my phone. This is the DirectTV app and not called DirectTv Now. This is free for DirectTV subscribers, and will be available until and if Obama's "Net Neutrality" causes Direct TV to take it down under the theory that the free mobile TV access gives AT&T customers an unfair advantage. The channels you pay for under your regular DirectTV subscription are available to watch, with the exception of local channels. The quality is fantastic. I have had no problem with cell reception even in most remote areas.
As I have unlimited data, it doesn't matter to me, but for those who don't have true unlimited data, the DirectTV doesn't count as data use. Quality is great. You can use the DVR in your home as well and play from it remotely, as long as your DVR is connected to the internet. I don't use this function, as I use satellite internet at a remote residence, without enough capacity to use the DVR function. I can, however, command my home DVR to record remotely using the app.
This works great for me, costs absolutely nothing extra, and eliminates the need for any satellite dish while travelling.
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