Samsung Galaxy S8
The Samsung Galaxy S8 is a great smartphone for seniors because it offers a large screen in a small package and it is easy to use.
This screen allows you to see more at once, or to make the text bigger, but still have a phone that is easy to hold with one hand.
This phone is water resistant. The slightly curved edges take a little while to adjust to, but the edges don't activate as many touches as older models do. This makes it is easier to hold without accidentally tapping on something.
You can put a microSD card in it to add more storage if you need it later and you can use the cameras to take great looking photos. There is an easy mode that helps simplify using the phone if it is your first smartphone, and then you can turn it on to a full smartphone experience when you are ready.