After upgrading S2 to 4.0.3 problems

[fercald]

I just upgrade my S2 to 4.0.3 and the internet stop working, I can received mail but
cannot open attachements ,same with AP widget wheather widget,
I try Wi-Fi and the same problem , any ideas how to fix it

[Tufftoad]

Sometimes after upadting it is known for the APN settings to be erased. If you go to the following on your device:

Menu > Wireless & Network > Mobile Networks > Access Point Names (this was the menu path on 2.3.*)

You should have 2 accounts, one for internet provided by your Network/Carrier and another for MMS/SMS.

If you are missing either APN's then press the Menu/Option button to create a new one. You can find the settings you need for the APN by googling T-Mobile APN Settings (replace T-Mobile with which ever network you are with).