Unlike Android or Symbian, the iOS is a completely closed smartphone system. Apple doesn't offer many methods for users to access folders on iPhone. It's not friendly for users who want to find where exactly the file is. In fact, you could only use iTunes to manage the files on iPhone. But, I think you have already met some iTunes music syncing problems. This kind of limitation has protected the system, but it also caused some troubles.
It is impossible to read iPhone data on the iPhone so that we need the computer to help us. The most used way to access iPhone is using iTunes. If you have tired of using iTunes, you could try Qiling MobiMover Free. This is the first completely Free iPhone data transfer in the world. You could transfer everything from iPhone to a computer, like photos, contacts, music files and other, or manage contacts and other files on iPhone directly. Check following tips on how to access iPhone contacts on the computer and how to delete certain or multiple contacts from iPhone.
Step 1. Connect your iPhone to your computer, either Mac or PC, with a USB cable. Launch Qiling MobiMover and click "Content Management > Contacts".
Step 2. Click "Select All" to select all the contacts on your iPhone or tick the checkbox next to the items you want to remove to choose specific items, then click "Delete" to delete the selected contacts from your iPhone. (Before you remove these files from your device, you are recommended to make a backup of them by clicking "Transfer to PC".)
Step 3. After clicking the delete button, you will see a new window asking you whether to delete the selected items. Click "Yes" in the window to confirm your deletion.