My iPhone 4S has been "unable to connect to network."  Have reset network settings, turned modem off and on, phone off and on, but not able to connect.  Any fixes?

dear tech support team please take care about me my 4s not working

Sorry, but we are all users here, just like you, and Apple is not following these discussions.
But here is what you can try in your situation, clicking on the blue links at the end of the post will take you to detailed descriptions to solve your problem.
To make sure that this is not software related, set it back to factory settings, without using any backup data afterwards. Set up the rest of the personal settings manually and test the phone.
If it still does not work, this is a hardware issue and the phone has to be serviced by Apple or an Authorized Apple Service Provider:
Use iTunes to restore your iOS device to factory settings - Apple Support
Find an Apple Authorized Service Provider
iPhone - Contact Support - Apple Support

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