I just updated my iphone4 to iOS5.1 and now I cant use my 3g, everything on my cellular data's right but I cant activate my 3g anymore, can you help me please? thank you! i really need it

I just updated my iphone4 to iOS5.1 and now I cant use my 3g, everything on my cellular data's right but I cant activate my 3g anymore, can you help me please? thank you! i really need it

Did you try to reset the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again? You will not lose data doing a reset.
If this does not work, set it up again as new device, without using the latest backup afterwards.
How to back up your data and set up as a new device

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