Smalltalk (Squeak and Pharo, perhaps Cuis as well) does run on the iPhone. At least at some time in the past there were a few apps in the Apple store which had

Smalltalk (Squeak and Pharo, perhaps Cuis as well) does run on the iPhone. At least at some time in the past there were a few apps in the Apple store which had been written in Squeak. The restriction was that it had to be impossible to break out of the app into the underlying Smalltalk. And the raw Smalltalk itself was not allowed in the store, but if you were a registered developer you could get it and load it into a small number of iPhones/iPads.