What is the exact difference between a USSD string and a SS string?
SS features as call waiting can be accessed from the phone menu.
But they can as well be activated by sending some SS string as *43# for call waiting. In this case, what is the difference with a USSD string?Is it handled as a USSD one or not?
When we send the string *43#, is it considered as a USSD string or a SS one?