The two services that spring to mind are DeviceAnywhere and the Xamarin Test Cloud , which came from Calabash's iOS testing service called โLessPainful,โ which Xamarin acquired.
Both of them use real physical devices, although I think they are hacked from memory. I did not use the Xamarin service, and the last time I used DeviceAnywhere, it was several years ago, but then it was not so scary (this was also not so).
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