I've had an S7 Edge since pre-order in February of 2016. I also bought a US unlocked S7 Edge back in January. I then bought another S7 Edge when T-Mobile was selling them for $360 back in February. The only one I still use is the blue one I bought in February BUT my 6S+ is my daily use phone along with my Apple Watch. I have one of my three T-Mobile sims in the S7 Edge still.
I have so many phones because I switch sims between them so often. In a few months, I may go back to using the Edge again or even my Note 5.
I bought a iPhone SE yesterday and one of my sims is in it now.
My next phone though will be the Note 8.