No service problem in iPhone 3GS after upgrading to i.o.s 6.

I updated my iPhone 3GS to i.o.s 6 and now i cant activate it.
Showing NO SERVICE even with a valid sim card.
Is there a solutio to get rid of this problem and get my phone working back?

You could go to settings/general/reset and then reset network connections.  that might help.
Or you could reboot the phone
Restart iPhone: Hold down the Sleep/Wake button and the home button together until the apple logo appears then let both buttons go and wait for the phone to restart.

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