If your iPhone 6 cannot be detected on iTunes 12 or if you have sync issues, I can assure you that you are not the only one. Many iPhone users experienced the same problem. This issue may show up in both systems, OS X or Windows.

Possible issues:

1. iPhone 6 cannot be detected by iTunes (OS X / Windows OS)
2. iPhone can be detected by iTunes, but cannot be detected in Windows Explorer (Windows OS)
3. iPhone can be detected in iTunes, but cannot syncing (OS X/Windows)
4. iPhone cannot be detected in iTunes, but can be detected in Windows Explorer (Windows OS)

Read also — Ultimate Guide How To Backup iPhone 6 and iPhone 6 plus to iCloud

The Preparation:

• Make a backup on your iPhone 6 through iCloud before you do the steps below.

• Do also a backup on a Mac/PC just in case the troubleshooting requires you to do something which can disturb the stability of your system.

Read also — How to Fix iPhone 6 Invalid Sim Card after Update iOS 8.2 Issue

General Troubleshooting:

• Restart the computer
• Update the iTunes to the latest version.
• Update your operating system to the latest version.
• Update iOS on your iPhone 6 to the latest version. See this: How to Update iOS on iPhone, iPad and iPod Touch
• iPhone 6 and 6 plus are using lightning cable, try to use the both sides of the lightning cable.
• Try to use the other lightning cable, which you know it works well.
• Try to use the other USB port

Read also — How to Solve iPhone 6 Randomly Restart Issue

The troubleshooting steps above may solve the issues, but if those solutions didn’t fix the problem try this:

iOS side:

Try to disable restriction if you have activated it.

Go to Settings — General –Restriction — Disable restriction

Windows OS side (Windows 7 or later):

Most of iTunes and iPhone issues occur in Windows OS, try several things below:

• Uninstall iTunes and all Apple related software.

• Delete the folder C:\Username\UserAppData\Local\Apple and Apple Computer
• Install the latest iTunes software, and then restart your computer.