When your iOS device is connected to your Mac, but the main PhoneView window says "No Device Connected", you can try the following troubleshooting steps:
- Open iTunes with the device still connected.
- You should be prompted to "trust this computer".
- If so, click "Trust".
- Then, open PhoneView, and your data will start to load into the main PhoneView window.
Also note that newer iOS devices may require a Mac running a newer macOS version. If you don't see your iOS device showing up in iTunes at all, check the device's specific system requirements. (For your device model, look for the section called Syncing with iTunes on a Mac or PC requires.)