The ability to reverse time changed more than anticipated.
A young man down on his luck attempts to barter his phone in exchange for a gift for his girlfriend. When the clerk has a better idea, the phone is enabled to reverse time and alter the course which caused the young man's misfortune. But, when the result caused time to also change the meeting of his girlfriend, the young man returns to get it all back.
This film was written, cast, and in the can within 24hours.