Mobile sexchat wapsite
A major one is that you can get access to WAP billing, where you can charge small amounts of money from customers that may not have credit cards available.
Also you can use the MSISDN (mobile phone number) to uniquely identify and track visitors to you WAP site.
Sites that are heavy in graphics or content simply don’t convert well to the smaller screen mobile phone.
The message would probably say, "Application could not be downloaded due to error (492)".
The issue Most people tend to use Whatsapp more than Facebook.
If you can support WAP in addition to HTML it makes a nice fallback for the clients which do not understand HTML.
Do remember that WAP has strengths of it's own that normal HTTP sites browsed from mobile handsets do not posess.