How to watch live match free on mobile?

Your best bet for free matches in the UK is to use official broadcaster apps. BBC iPlayer and ITVX are brilliant for major tournaments and FA Cup games. They won't cost you a penny. Also, some bookmakers’ apps stream certain matches if you have a funded account. You often don't even need to bet on the game itself. I'd steer clear of unofficial streaming sites, though. They are usually unreliable and full of dodgy pop-ups.