Q: I have an IPhone 5S and ordered a new IPhone 6S how can I transfer the data from my old phone to the new one ?

Hi

Go to iCloud back up now on iphone 5s

Then when you set iphone 6s use same apple ID & iCloud back up

Do this over your WiFi .

Cheers

Brian

Plug the iPhone 5s into iTunes and make an encrypted backup (do NOT forget the encryption passcode). An encrypted backup is the most complete data backup you can make for an iOS device as it includes passwords and other such sensitive data that is not part of an unencrypted or iCloud backup.

Then, plug in the new 6s and restore it from that backup. Your new phone should be set up exactly like your old one, even settings.

see Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support

and About backups in iCloud and iTunes - Apple Support

Everything you need to know. Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support

Hi

Before you backup to iCloud update iphone 5s to ios 9.1 or backup

Will not work on iphone 6s.

Cheers

Brian

That is not correct. You can restore an older iOS backup to a newer iOS device. You cannot do it the other way around.