How do I fix the problem? As I have upgraded my I phone 6S to IOS 10 but suddenly it appears an ITunes logo?

Hey Derek from Malaysia,

Thanks for your post! I see your iPhone is showing the iTunes logo after updating to iOS 10. I hate to hear you’re having issues. I know everyone is excited about using the new features. I’ll be happy to help.

Take a look at this article: If you see the Connect to iTunes screen on your iPhone, iPad, or iPod touch - Apple Support

Try the steps here:

Make sure that you're using the latest version of iTunes.

To restart your device, press and hold the Sleep/Wake and Home buttons at the same time until you see the Apple logo.

If you still see the Connect to iTunes screen after you restart, you need to reinstall iOS:

1. Connect your device to your computer using the cable that came with your device. You should see this message: "The software on [your device name] needs to be restored to factory settings or updated."
2. Click Update (not Restore) to reinstall iOS and keep your personal data.

That should get you back up and running.

Take care