The popup in the Venue theme does not display on mobile devices.
The reason we have done this is because Google has started penalising sites that has intrusive popups (or interstitials as they are known) on the mobile view of the site. Here's a direct quote from Google.
“To improve the mobile search experience, after January 10, 2017, pages where content is not easily accessible to a user on the transition from the mobile search results may not rank as highly.”
You still have the chance to ask people to sign up to your mailing list using the form in the footer, which displays on mobile - read this article for more on how this works with your customer lists.
Still want it to work on mobile?
If you are aware of the risks and still would like us to activate the popup on the mobile view of your store please submit a request using the link at the top of this site and we'll send you some custom CSS.