Share your experience!
I purchased xperia u 3 days ago ..on 1st day the wifi ran good....but on second day it didn't connected to my wifi than i talked to customer care they told to repair the software by pc companion even i tried it but it worked for a day and again i m facing the same problem of not connecting to wifi.....i can't understand what to do.....what is this sony ....i had great expectation with mobile but all have been destroyed due to wifi problem.....today i m visiting the shop from where i bought and see what could be done about it.....i think after ics update this problem could be repaired...plz sony launch ics fast in india....
Check the link below for a bunch of tips when it come's to wifi-issues! 
http://talk.sonymobile.com/message/154244#154244
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YAY nothing worked but this worked for ma:
"if you have acces to root, try to delete everything in folder "/data/misc/dhcp"..worked for me"