How many smartphones does a developer need for 3 platforms?

Question

iPhone

Hello dear!
I saw that it was already asked here - and I roughly understood the answer. But I would like to clarify in terms of a "cross-platform" mobile application and specific and current prices.
Let's say the task is to make the application work on smart phones and tablets immediately on Android, iOS and Windows.
How much will the very initial set of smartphones and tablets cost in order to somehow test for three platforms?
Thanks in advance to everyone for the replies!
Sincerely,
Alexander

Answer 1

The most basic set is emulators. Especially if it's an app and not a game. Then everything depends on the specifics of the application.

Answer 2

Buying smartphones is a road to nowhere. Too many of them. The best solution is a cloud service like Xamarin Test Cloud