Unlock your iPhone by pressing the Home button. If you have enabled a passcode lock on your iPhone, or if you are connecting the iPhone to your PC for the first time, the below message will appear in the CopyTrans program window.
This is how to unlock the iPhone and trust computer The prompt message appears on the iPhone and is designed to prevent unauthorized computers to access your iPhone data. Connecting an iPhone, iPad, or iPod Touch to a computer generates a prompt to trust the computer before the connection can be established.