use this link
http://www.sonyericsson.com/spg.jsp?...=pg&tl=support
select Region ---> Country ---> Support ---> PHONE SETUP
then you look at this list of options
Software and setup
Software downloads
Sony Ericsson Update Service
Mobile Internet (WAP)
Picture messaging (MMS)
-choose mobile internet (wap) first and input all the fields that are required
-you will get a message INTERNET SETTING RECEIVED click ok
-try to connect to the internet after that.