Yes, the Alexa App is all that is needed for our Echo devices, and it is available on iOs. You would simply go into the app store on your phone and download the Alexa app, create or sign into your account, and when setting up your Echo Show 10, you would use that same account info. Then you would have the ability to access your Echo Show 10 from your phone as well to do things like drop in and even choose what music or announcements are happening from your Echo Show 10.
Hope this info helps. Have a great day!