Although Unlimited WiFi (Speed WiFi W04) was originally set as English language delivered from GB WiFi, there are some cases WiFi is reset and back to original state of Japanese language. Here are the step-by-step instruction on how to set Speed WiFi w04 in English display language.
1st. step: Choose Red mark below
2nd. step: Choose Red mark below
3rd. step: Choose Red mark below
4th. step: Choose Red mark below
5th. step: Choose Red mark below
6th. step: check if it is changed to English as below
Finally check home screen if it is changed to English as below