B-mobile is another provider looking to break into the eSIM game. With the unique appeal of a customizable plan length, they’re worth a look for any Japan trip. Their eSIMs connect to the stable Docomo 4G network, offering constant, reliable access.

B-mobile offers plans covering everything from 1- to 30-day stays, with allowances between 1GB and a staggering 100GB. Their shortest plan starts from ¥744 for the 1-day, 1GB plan, and goes up to ¥16,280 for 100GB across 30 days. The best value plans tend to fall in the middle, with around 40GB/15-day plans being optimal.

Plan ahead of time though, as the eSIM took 40 minutes to arrive for us. According to the website, it can take up 15 hours.

Compare popular eSIMs for Japan.

Our tests

(Upload/Download/Latency, in Mbps)

Tested on

Test 1 (Setagaya): 20.6/12.3/69
Test 2 (Shibuya): 19.8/10.1/61
Test 3 (Shinjuku): 20.63/4.96/45
Average: 20.11/9.35/58.33