I got the same iPhone plan with Claro since +2 years, paying 229$ for unlimited internet (no cap on GB traffic... he he.. Since I tethered it to connect my PC, I download up to 3GB a night of data).
Claro's customer service is really aweful though but well, can't complain too much since they don't cap the GB use.
I noted the 3G works really bad during & after rains but Claro can be accessed from almost everywhere in the Province. In the Centro, Claro sucks (no 3G, no signal at all at times & such).