Of all of the streaming network appliances I've tried, my favorite has always been Amazon Fire TV Stick. They've got great content, a ton of free apps that hook into popular services like Netflix and YouTube (and much more I'm currently leaving out) and is the easiest to set up. It's not paired with a phone, but with a remote that comes with it which believe it or not, is probably the better of the two options.
Right now, the regular Amazon Fire TV Stick is on sale for $34.99, a pretty darn good price for a product that will literally give you hours of entertainment. Hook it up to your TV's HDMI port and you're on your way to streaming music, TV, and movies all for free.
Note: Of course, it does help to have Amazon Prime membership to make the most of it.