Antibiotics work on bacteria, so viruses are not effected by antibiotics. Do not take antibiotics for a viral infection.
Now that that is out of the way, I like the idea of using bacteriophages to take out antibiotic resistant strains of bacteria. A bacteriophage is a virus that specifically can target and lyse (kill) the target bacteria. Of course, within a population of bacteria, there can be naturally occurring resistance to phages. This resistance, of course, can be due to the bacterial immune system known as CRISPR. Funny how that works.