Should you get a phone? No, just get a plan! I have Verizon in New York. I don’t know all the details, but I heard of a new Verizon plan where users are billed US$2/day for air time among the U.S., Canada, and Mexico.
Since I’m here for only 4 months, I haven’t looked into it much, but I did have to make unexpected long-distance calls that jacked my bill up about $30, so I would opt for a plan that is right for you. DON’T make the mistake I of trying to switch your SIM card on your phone for a local number. It is a headache and a waste of time. Keep your phone and get a plan.
Free calls and texting with apps like WhatsApp and Skype. Did I mention they are free and the calls are free, as long as you have wi-fi.