Mac does not recognize iPhone when it is connected by USB My iPhone fails to connect to my mac via USB charger. The USB port and the cable are working. System Information shows that "unknown device (...not been configured)". I don't know why this happens?
Lots of reasons this could happen.

Rather than us guessing, here's the recipe for isolating the cause:


https://support.apple.com/en-us/HT203979 - If you don't see your connected device in iTunes for Mac