Returned from 10 days in Peru, with coverage that was often better than what I enjoy at home. Speeds as expected, with somewhat high latency but low jitter, which made for clear (if not slightly delayed) VoIP calls. This trip was one of the rare times I found myself missing my old Bold 9700's UMA chipset, as the subpar voice quality in T-Mobile's Wi-Fi calling app on my HTC One was magnified to the point of being more or less unusable, negating the benefit of free calls whilst on Wi-Fi.

My biggest recommendation would be to try and stay on Movistar as much as possible -- it seemed whenever I roamed on Claro, speeds plummeted or the connection stopped working entirely.