No one, who has a phone, has traveled and definitively tested (or at least reported about it openly) but there should be some connectivity in some areas. There is some overlap on the bands (shown here best) and it depends on what networks you use. Interestingly, if voice is the main thing you want to make sure works, PLS8-US and BM818-E1 and -T1 have that covered best. As @Caliga already pointed out, you can swap the modem if needed (but be mindful that the connectors are not rated for doing that often). If you know which areas you frequent, you can check the networks (which bands they use) and plan your modem purchase(s) accordingly. For instance, within South-America situation is similar.