Are you using the HUAWEI mobile wifi by Globe?
Take off the battery and you should be able to see the IP indicated in bold characters for example (192.168.8.1). The default key or password can be found in the back cover.
1.) Switch the mobile WIFI ON.
2.) Use your laptop or computer to connect to the WIFI and access the GUI IP ex.192.168.8.1 to any browser.
3.) Default login username and password should be admin. You can change this in settings once you've successfully logged in.
4.) You should be able to access internet settings where you change the password.
I hope this helps.