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i have a problem with the internet, when i use wifi its ok but when i try to use 3g the internet is either very slow or no connect at all.
i use wcdma (3g) or gsm (2g) the same result
Settings > about phone > status > signal strenght
post the numbers here.
You might have an old or SIM card that's acting up
Do you have a MICRO SIM card or did you trimmed a regular SIM card?
-93 dBM 10ARX
i recently change my sim card to multiform card (you can make it sim or micro or nano sim)
the same happens everywhere. im trying to connect in many places
Contact your carrier/network, you could repair the phone with PCC but this seems to be a carrier/network issue.
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355