Testing game on different devices

Hello,
i have been developing an iOS game and testing it on my device (iPhone 6). How can I test my game on different devices of different resolutions using simulation, without having to buy other devices? Is it possible?
Thanks.

I recommend AWS Device Farm for iOS: AWS Device Farm | Mobile & Web App Testing | Amazon Web Services and Firebase Test Lab for Android: Firebase Test Lab | Test in the lab, not on your users

Thanks, are there any other cloud services for iOS?