It's a good idea to save the log in page as a shortcut on your phone's home screen, making it easy and quick to open with a single tap. How to add a webpage as a shortcut to the home screen depends on your phone model.
You can add a shortcut either when the service login page is open or when you are already logged in to the service.
Adding a shortcut in Chrome
In Chrome, a log in page shortcut can be added to the Home screen by clicking the three dots at the top of the browser, next to the address bar. From the drop-down menu, select Add to Home Screen.
Adding a shortcut on an iOS phone
On your iOS phone, you can add a shortcut via the Share button situated in the middle of the bottom of the browser.
Then click Add to Home Screen button.