If you do have a device with infrared support, you can install Power Universal Remote Control and then set it up. All you have to do is choose your TV model and just a few seconds later you can start switching channels and changing the volume.
Some popular Android devices that are compatible with the app are the Samsung Galaxy S4, S5, S6, Note 3, 4, LG G3, G4, and HTC One.
Power Universal Remote Control is an interesting app for those who watch TV regularly, but remember that to use it you need a compatible device.
Requires Android 2.3 or higher