Data transfer?

Question

iPhone

There are iphone 4 and 4s, you need to swap the contents (Contacts, photos, music, applications), that is, so that all the contents of iphone 4 move to iphone 4s and from 4s to 4.
Tell me how can this be done?

Answer 1

make backup copies on both devices and on each restore from another device

Answer 2

You can make a backup copy of the first one, then rename the folder with files where the tuna writes a copy - make a copy of the second iPhone. Continue in reverse order :)