Or it may be that you have free wired access within the room .... but the wireless has a fee.....
In this case, at least, it's the opposite.
High Speed: We now offer High Speed Internet access in our guestrooms and suites. The Mirage High Speed Internet is a combination of Ethernet and Wireless connections. This High Speed access has wireless capabilities and offers download speeds of 1.5 MB. There is no charge associated with the internet access, as it is an inclusion of the resort fee. If a wired connection is preferred, Ethernet cables are available for purchase in the guestroom mini-bar.