If your smartphone has an infrared sensor, it’ll make everything easier, since the device you are going to control does not need an internet connection (or Bluetooth, for that matter) to receive the commands. To find out this information, consult the manual of your device, however, but that already gives a basis.
One of the conveniences of having a smartphone is that it is not very difficult to control your TV through it. If your smartphone has an infrared sensor, the possibilities are even greater to control basically anything that accepts a remote control. Just use the right app.
One of the best apps to take advantage of your IR sensor is AnyMote Universal Remote, which, as the name suggests, turns your phone into a universal control. The application also allows you to organize devices by room, so when you open the menu of the room, it will bring together the controls for TV and DVD player.
If AnyMore doesn’t work well for you, you can also test Mi Remote, ASmart Remote IR, Sure, Peel and the IR Universal TV Remote. The latter allows you to customize the controls for each device, organizing the setup in the way that is most convenient for you.
If your smartphone does not have an infrared sensor, you can still try something. The Easy Universal TV Remote app lets you control TVs from more than 100 different brands, makes it easy if they have a Wi-Fi connection.
In addition, you can be a little more specific and look for a remote control app made by your own manufacturer. Especially for Smart TVs, you should find something that fits what you need. Here are the official apps for major television brands: Samsung, LG, Sony and Panasonic.