Install a travel eSIM before you fly and you'll have data the second you land in Japan — no roaming charges, no hunting for a local SIM. Pick a data plan, scan the QR code, and you're online.
eSIMs work on most phones from the last few years. Keep your home number for calls and texts while the eSIM handles data. Plans are pay-as-you-go, so top up only what the trip needs.