When switching from iPhone 4S to New iPhone 6 Plus, you must want to transfer all data from iPhone 4S to iPhone 6 Plus. Here is a video guide about copying contacts, messages, video, photos and music from iPhone 4S to iPhone 6 Plus, no need with iTunes.

Watch the guide:

https://www.youtube.com/watch?v=NcG6yuuixFQ

Phone to Phone Transfer for Android, Symbian & iOS
> Transfer various data like contacts, messages, photos, music, videos and apps
> Support Phones from Apple, HTC, Motorola, Nokia, Samsung, Sony, and More
> Work with new Motorola Nexus 6, Samsung Galaxy Note 4, iPhone 6 Plus, etc

Here comes a good news! We can backup any data on iPhone/iPad/iPod to iTunes, Computer and Back in a simple way!
With iPhone Data Transfer software, you can transfer videos, music, photos, playlists, contacts and more from your iPhone, iPad and iPod as easy as pie.
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If you lost data of your iTunes library, replaced your computer or even re-installed OS and forgot to back up your iTunes library, you might have lost your media on iTunes. Even if you try to sync with your iTunes account from your iDevice, it will almost surely be wiped out.

Okey, all you need is iPhone Data Transfer program to restore everything in your iTunes library with ease.
If you want to have a try, you can follow the steps.
how to transfer photos from iPhone to iPhone

How to Transfer Old iPhone Data to iPhone 6 Plus

How to Transfer Data from iPhone 4S/5/5S to iPhone 6S

http://how-recover-iphone..com/