How do you know how different phones will allow your readers to navigate "Back To Mail" after clicking on a link in the body of the email and viewing content on a website. Iphone 6+ iOS 9 dispalys Back to Mail in the upper left corner, but others are reporting they do not see this and the user experience is impacted by having to exit the website and click back to the email, to begin again.
Is this issue associated with different phone carriers and phone types?
Does this have something to do with individual settings on phones?
Does iOS matter?