I would say “Cell” is worth watching. I watched it twice, definitely enough moments to keep you entertained, has you rooting for the protagonist, the atmosphere is done well, there’s just not enough that’s unique with the film or cinematography to make it stand out. Overall I give it 2.5 stars, just average, serviceable, a good story but sort of a dull movie, watching the film does make me want to read the book though.