Iphone 3g doesnt work after ios5 upgrade

i upgraded my iphone 4 but now i can't use facebook, get my emails...anything that uses the internet isn't working anymore!! it says 'could not activate cellular data network...'etc...please help!!
i can only use it for texts, phone calls and camera at the moment which is not why i chose iphone!

Muskelkraut wrote:
after upgrade of iOS4 on my iPhone 3G the battery perfomance decraeses dramatically.
I use the 3G-mode and bluetooth, but no location id service and no wifi, but the battery runs empty within 4 hours. As far as I know, multitasking is not available for my 3G.
with the previous OS my iPhone runs nearly 2 days with the same settings und usage.
What should I do?
Settings/General/Reset Reset Network Settings, then reboot (hold HOME and SLEEP until an Apple logo appears)
If you have an Exchange email account and still have the problem do the following:
Settings/Mail,Contacts,Calendar, tap on the Exchange account and delete it. Reboot. Go back to Settings and add it back.
There are other possibilities, including misbehaving applications, but this is a common problem with Exchange.

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