I have a iphone4s and i up date it to ios 6,1 and now doesnt have linesignial

i have an iphone 4s ios 5.1.1,and i just up grade to ios6.1 and now i cant make and recive calls...

It would worthwhile doing a reset on the iPhone. To do this press the 'Home' and 'Sleep' button for a while until the screen goes dark and the Apple logo comes up. Then release the buttons and let the phone do its reboot.
You will not lose any data/apps or anything by doing this but I hope that your hone then works properly.
Good luck.

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