Before my trip to Tokyo last month, I thought long and hard about whether to buy the Mobal Japan Pocket WiFi https://www.mobal.com/pocket-wifi-japan/ . I was hesitant at first, but I decided to take a chance—and I can tell you right now, I haven't regretted my choice for a second. The signal was stable, and the speed was excellent. The router itself is small, convenient, and doesn't interfere at all. I used it all day without any issues—it's truly amazing.