Upvote:1
You can pop a SIM card into your phones. The Verizon LG V10 and the Verizon Droid Turbo have at least one LTE radio band necessary to talk to at least one Japanese carrier (Band 3; NTT DoCoMo and MVNO operators using their network) in what appear to be limited areas, so don't count on it working everywhere. 3G doesn't appear to be a problem, though.