If you have a pre-iOS 11* device, "The Lost Adventures of Infocom" should still be for sale in the App Store. It has a dozen-ish of the actual Infocom classics.

If you have a pre-iOS 11* device, "The Lost Adventures of Infocom" should still be for sale in the App Store. It has a dozen-ish of the actual Infocom classics. Best on an iPad, but I think it's usable on a phone. *They didn't -- and won't -- re-build it to cross Apple's 64-bit barrier, so you can't play it after iOS 11.