Google has you covered for SMS via the PC, or any device with a web browser I suppose.

Cinemascore is generally a better barometer for audience grades, since you know the people polled actually saw the film. First example that comes to mind, critics loved Hereditary (as did I) but the Cinemascore grade was a D+. So does that count, since the masses hated it? Or does the film in question also need to be savaged by critics? Freddy Got Fingered seems to have been universally loathed, so if you're like my wife and enjoy that one - you win the grand prize!