Computer can't find iphone.I can't even hear a device connecting sound.Cable is working.I can't find iphone on device manager too

Computer can't find iphone.I can't even hear a device connecting sound.Cable is working.I can't find iphone on device manager and in control panel too

The phone is stuck in this mode because it needs to contact ATT's activation servers when you plug it into itunes. There is most likely a connection issue Firewall/Antivir software blocking certain connections/ports.
Common AV/Firewall programs that cause this issue: Norton, Mcafee, Zone Alarm, and CA (computer associates).
Unfortunately you cant fully "disable" these programs so its a matter of knowing how to configure them or remove them completely using their respective removal tools.
Otherwise, bring the phone to an Apple Retail Store or ATT store to have them activate it for you.
Hope that helps.

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