Using the translate facility a long way further south than Mexico, and even though we invariably use it off-line (which means that it doesn't speak the Spanish) it is remarkable just what complexities it will handle. Take a photo of a sign and it translates that as well. Currently using it in Brazil while we are staying with a family and even though they can speak English fairly well, it is surprising how often the smart phones get called on to translate unusual words or phrases
Lots of other apps that are genuinely useful as well.