Ios8 and iphone5s lost cell connectivity - how do i get it back ?

How do I get cell connectivity back after upgrading to ios8 on my iphone 5S

tried the reset same situation - still no connectivity. I upgraded the os to 8.0 and the thing stopped working as a phone .....the apple site tells you to down load a file which is for an iphone 6 nothing about iphone 5...when i try to install ios8.0.1 as a fix it tells me that I can't it trys but comes up with a message Unable to Install Update An error occurred installing iOS8 8.0.1  

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