Yes, we use two of them and they are on 10.2. I cannot say that I notice much of a difference since updating. The phones continue to do the job they were bought for three years ago.
The addition, through updates, of various bells and whistles all go over my head I'm afraid.
We have no wish for larger phones so have little interest in the 6 or 7 models, however, when I finally decide to upgrade, it will probably be to the SE or equivalent.