For instructions on setting up, retrieving, changing and resetting your voicemail password, text the word VOICEMAIL to 611611 or click here. WIFI. For instructions on setting up and managing Wi-Fi on your phone, text WIFI to 611611 or click here.
As the first process, authentication provides a way of identifying a user, typically by having the user enter a valid user name and valid password before access is granted. The process of authentication is based on each user having a unique set of criteria for gaining access.
In short, please. :-). Authentication = login + password (who you are). Authorization = permissions (what you are allowed to do). Short auth is most likely to refer either to the first one or to both.