Wireless password transfer from mobile to mobile?

I have a cell phone where the password for a Wi-Fi is inside, so I typed it once (Samsung) and another phone a new Huawei. Unfortunately, I do not remember this password. How can I transfer the password from one mobile phone to the other, or find out the password so that I can switch from both mobile phones to WLAN.

If your router is yes can see or connect via WPS, otherwise ask the the WLAN belongs to the password