MIME Types Required for WAP
 
Either of these options should work
 
Include this text in /etc/httpd/conf/httpd.conf - Apache Config File

AddType text/vnd.wap.wml wml
AddType text/vnd.wap.wmlscript wmls
AddType application/vnd.wap.wmlc wmlc
AddType application/vnd.wap.wmlscriptc wmlsc
AddType image/vnd.wap.wbmp wbmp
 
AddType application/xhtml+xml xhtml

Or, preferably, include this text in /etc/mime.types

text/vnd.wap.wml                wml
text/vnd.wap.wmlscript          wmls
application/vnd.wap.wmlc        wmlc
application/vnd.wap.wmlscriptc  wmlsc
image/vnd.wap.wbmp              wbmp
 
application/xhtml+xml           xhtml