Where is the best deal for cell phone rental for use while travelling in Argentina and Chile?

just buy a phone that you can put pre-paid minutes on. Its cheaper than trying to buy a plan and a lot easier to pay as you go. You can pay as you go with text messages too, which, from what Ive heard, is a preferred way to save minutes and make all the contact you need to.

bring you unlocked phone and put a cheap prepaid card inside