We are on the premium family plan in the UK. My son has recently inherited a iphone 5 with iOS 10 10.3.4. How can he use spotify?
Welcome to the Community and thanks for posting your question here.
We can confirm that iOS 11 is currently the minimum system requirement for using Spotify and accessing Spotify content through the Spotify app on iPhone.
You can take a look at this support site article to get to know more about our system requirements.
Hope you'll find this info useful. Let us know if there's anything else we can help with!