You should be able to display your mashup on mobile, how well it works depends on how you have developed it, but the Qlik Sense visualizations work on mobile too.
You would however need a server installation of Qlik Sense to be able to reach it from mobile.
Are you running it on desktop or server? I assume you're running it on a desktop..
One method we use for demoing and testing our mashup/applications is creating a proxy to our localhost, for this you can use ngrok (there are others, this is just personal preference). Download ngrok ngrok - secure introspectable tunnels to localhost and configure your app to use ngrok url (read the docs).
