I imagine you would be able to, as long as your phone doesn't give other DMA behavior (prompting for alternative browsers, allowing alternative app marketplaces

I imagine you would be able to, as long as your phone doesn't give other DMA behavior (prompting for alternative browsers, allowing alternative app marketplaces, allowing side-loading). You will need to have both a Siri language and a Region of US English currently, as the models have not been further localized.