For the 3GB/day data SIM/eSIM, the actual speed depends on the conditions that you are in, but you should be getting 3 ~ 30 Mbps connection.

For the Unlimited data SIM/eSIM, if your phone supports Japan’s 5G network bands, then you will experience around 6 ~ 255 Mbps, with an average of 180 Mbps speed, based around our internal testing at our office.

If you are curious to see if your phone supports Japan’s 5G network, you can refer to our compatibility page or contact us and inform us of your phone model at contact@sakuramobile.jp.

For both 3GB/day data and Unlimited data SIM/eSIM, the speed may vary depends on the time range (lunch time, etc), the location, the signal level, radio frequency band you are on, and the number of devices around you.