Use iphone 4S as ipod touch
Hello,
I recently bought the iphone 6 Plus. I'd like to use my iphone 4S as an ipod touch for my son. If I continue to use my applet ID to access the App store on the 4S will it affect my storage of anything on my 6 Plus? I don't want to reset the 4S phone since there are many apps on there my children use. What steps do I need to take in order to keep the 4S as is, and ensure the contents of the 4S don't get backed up to my 6 Plus. Also, if I don't have a text/phone plan for the 4S can my son still text from the 4S using WiFi?
Thanks,
Kristen
iPhone 4S, iOS 7.1.2