iTunes is only single interface for the all Apple fans to move any kind data. That’s work for all apple device and Your Desktop or Mac. In that, some of the facing very serious problem like iTunes crash while open, iPhone 7 or iPhone 7 Plus not showing in iTunes, taking too longer time to detect in iTunes. So, millions of people are moved to third-party software or Tools, But not useful all the time. You must have to fix this problem in alternate ways.
Here I identify common problem and mistakes that we should repair first, then balm to apple. Otherwise all the things are fine for you.
Steps for iPhone 7, iPhone 7 Plus not showing in iTunes: iOS 10
Update iTunes: Install iTunes version should be Up to date with latest version. Check on Mac iTunes > Check for Updates or on Windows Help > Check for Updates.
First unlock your device screen using Touch ID or Password and Accept trust on connected system, Tap on Accept from Verification popup on iDevice.
Check USB cable working, Connect Another device or Try with another USB lightning cable.
Restart (Press and hold Sleep/ Wake button until you show apple logo) or Force Restart (Press and Hold Sleep/ Wake + Home button until you show apple logo). iPhone 7 Plus Forceretart (Press and Hold Sleep/ Wake + Volume down button) has been changed also Mac/ PC and iDevice
Repeating same problem in Future again and again contact apple support in store.
Windows PC: Check Apple mobile device Driver installed on system. Find “Device Manager” from Bottom box, Under Universal Serial Bus controller > Apple Mobile Device USB Driver. If you found down arrow there, first update mobile device Driver manually.
Check USB Driver on Mac: From Top menu click on Apple Logo with Hold down Option key. Select USB from side pane, Under USB device Tree check iPhone is showing in tree. If not then contact apple support.
More troubleshooting and help will be update here on iPhone 7 or iPhone 7 Plus not showing in iTunes while connect over USB.