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as i upgraded my phone to android 4.0 it does not let me use 3g. can someone help please?
Welcome here
After Upgrading to ICS the settings of Wifif and all the datas are cleared so you will have to make the setings of data again ie set up the apn again
If you got time then please visit here:::::::::::::::::
TOP APPS for XPU::::
http://talk.sonymobile.com/thread/58158?tstart=0
Latest firmware ICS here and the guide to install it
http://forum.xda-developers.com/showpost.php?p=35339192&postcount=173
Custom Roms::
http://talk.sonymobile.com/thread/56689?tstart=0
If you are rooted then please visit
http://talk.sonymobile.com/thread/56641?tstart=0
http://talk.sonymobile.com/thread/56642?tstart=0
If you want to root:
http://forum.xda-developers.com/showthread.php?t=1886460
Please Mark
Try this: Main Menu > Settings > Xperia > Internet Settigns Download.
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You can call your service provider and request for the MMS settings! 
thank you sooo much! it took me forever to find out