Q: I accidentaly deleted my iOS from my iPhone 4S

Check out this to help you out: If you see 'No SIM' alert on iPhone - Apple Support

martinfromdolny kubin wrote:

 

Hello users!

I had problems with my sim card, i couldn't call because my iPhone doesn't read my sim card. So i just opened that files and i accidentally deleted one file as i remember. Now when i will turn on my iPhone it just shows that small Apple logo when i turn it on but after it nothing happends. So i want to ask you if i can repair it or i must go to the Apple store and they will look at it.....i am affraid of that price OH!

What do you mean you "just opened that files". There is no user accessible file system in iOS. You also can't delete parts of iOS. Unless you've done something like jailbreaking your phone.

Have you followed the steps in this article:

iPhone, iPad, or iPod not recognized in iTunes for Windows - Apple Support

There is no cost to have the Apple Store look at your phone.