The way you do this, is that you set up your phone to communicate with your PC as though it were a hard drive. Then you copy the files to a local drive.
After that, you import the videos into Premiere Pro.
Simple.
If you expect to connect via USB, you have to tell your camera what to do. And if you expect to edit the videos in Premiere Pro, you have to tell Premiere Pro to import them. It is simple as that. Do NOT tell Premiere Pro to import them from the phone directly, because if you do, you will have to keep the phone connected to edit the video, and it will be VERY slow.