Function of PalmOne Tungsten T5 (PDA)

T5 have a large screen comparing to Zire 72s.
However, if you really want to buy one, I would recommend the new TX.

Yes it got fewer memory but it is cheaper and can have wireless connection.

Function in PDA really depends on what software you install.
The basic function of all PDA are play multimedia files, address book, calender and todo list