Be eager to move all the data from your old phone to the new one. The fastest and the easiest way to transfer all the contacts, messages, photos and more from Samsung, HTC, LG, Sony and others to Galaxy S7 is using MobileTrans. By the way, your old phone data can be erased completely as well.
To transfer data between two android phones, I think a data transfer is needed, we often switch between two phones, so regular data transfer can be a normal thing. Have a look at this
phone transfer tool [mobikin.com], you can also transfer other data with it,
transfer contacts from android to android [mobikin.com]