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Create a cohort of users who have browsed your site on their iPhone
This simple cohort includes every user who has ever browsed the site on their iPhone. A user's device can be inferred from their user agent. For iPhones the user agent will contain 'iPhone'.
This cohort contains all users who have browsed your site on their iPhone at some point:
This cohort contains all users who are browsing on their iPhone currently (during this session):