Wireless anything what advantages and disadvantages?

Advantages:
When compared with dial-up
· Fast as broadband access
· IP numbers can change, such as Dial-Up Access
· Can access anywhere, provided in hotspot areas
· Cheap, fast and flexible
· Umbrella for many users in a hotspot.
Disadvantages:
· To use the WiFi we must exist in an area accessible by WiFi or the term 'hotspot'.
· WiFi coverage area is still small, the signal can not penetrate walls.
· Access Point is more easily infiltrated by a virus
· Bugged easy data exchange