Our visa I got a near blue rate ( like 530/dollar as opposed to 590/dollar vs 290 official rate), much better than the official rate/ our master card I haven’t seen the bill yet - and our cards are based in Japan). I tried to use the cabify app, but could not get my telephone to verify. I ended up using uber which was okay.

As to the phone snatching, I was wandering around using my smartphone gps, but I was warned by one local not to do it, even though I saw a number of people in Ricoleta doing it.