Walmart expects 40% of its traffic to come from mobile devices, much of that from customers shopping on their phones whilst inside a Walmart store.
The link below takes you to an article that describes how the Walmart in store app can flip the user to in store mode.
Omni-Channel in action………
http://news.cnet.com/8301-1035_3-57548785-94/how-walmart-is-going-all-out-with-mobile/