I spent a long time preparing for my trip to Japan, trying to plan everything in advance. The most confusing aspect was mobile phone service. Finally, on the advice of friends, I decided to try a Mobile eSIM
https://www.mobal.com/japan-esims/ (though even that was without high expectations). I was surprised by how convenient it turned out to be. The connection was reliable both in big cities and while traveling. I constantly used the navigation, translator, and searched for interesting places—no problems. This is really important when traveling, especially when you're alone in a new country. My experience was nothing but positive.