My iphone 4 signal bars arent working

i changed the screen of my iphone 4 and after turning it back on my phone said it needed to be restore from itunes or apple.com/support i haven't been able to make any calls because it does not  recieve signal at all. it is always searching it

I had this problem too and when I attempted to upgrade my IOS following the advice of an Apple store employee, my phone is now stuck in recovery mode with -1 error not allowing me to restore.
Any advice will help, Thanks

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