Question on mobile-ready sites, bandwidth, and error messages in 3rd world -- for short article on mobile web

Hi, I'm trying to write a short online article on mobiles and how they are something of a solution to the limited bandwidth (particularly in the third world).  I have a couple of quick questions -- hope these are not off-topic; the questions cover two different issues, so I am sending two emails.  Here's the second question:

2.  Is having a mobile-ready web page normally include the idea of having a page that does not take much bandwidth to download?  And is the likelihood of getting a 404 not found message in the third world increased because of bandwidth issues? 
 
Best,
 
--C. E. Whitehead
cewcathar@hotmail.com