Claro was a waste of time and money for their data SIM, and them expletive expletive expletive would not give me a refund. Claro's 3G on the iPhone sucks big time.

I got a Vivo data SIM yesterday afternoon for R$49 for 500MB for the month and finally got it working this morning (not within the 2 hours they said it would take). Vivo's 3G service is working fine so far, and after all the hassle I am finally happy!