How to remove itunes from an old iphone 6

Hello 0rizaba,

Thank you for reaching out in Apple Support Communities. It sounds like you'd like to remove the iPhone 6 as it is associated with your Apple ID account. You can remove the iPhone 6 by using a Mac, PC, iPhone or an iPad. Here's how:

Use a Mac or PC to find or remove your associated devices

1. On your Mac, open the Apple Music app. Or on your PC, open iTunes for Windows.

2. From the menu bar on your Mac, choose Account > Account Settings. Or from the menu bar in iTunes on your PC, choose Account > View My Account. You might need to sign in with your Apple ID.

3. Click Manage Devices. If no devices are associated with your Apple ID, this section won't appear.

4. If you want to remove a device, click Remove. If you can’t remove a device, sign out of your Apple ID on that device and try again. If you still can't remove it, you might need to wait up to 90 days to associate the device with a different Apple ID.

Remove your associated iPhone or iPad

1. Tap Settings, tap your name, then tap Media & Purchases.

2. Tap View Account. You might be asked to sign in.

3. Scroll down, then tap Remove This Device.

This information is outlined in this article and can help: View and remove your devices that are associated with Apple ID purchases - Apple Support

Kind regards.