A portal application is provided that can be used on a mobile device to display relevant advertising content to the user at convenient times. The portal application can utilize a portal browser that is launched when appropriate, which displays the advertising content in an interactive way and enables the user to follow up with tasks requiring a data connection that is currently unavailable, by keeping track of a user queue. The advertising content may be filtered from a base of advertising content provided by the advertising content providers in advanced and is pre-fetched and stored in an advertising content cache for convenient access when appropriate. The portal application can be used with a location estimator to narrow and categorize the advertising content at least in part based on location, either physical location or preferred location or both based on a hierarchy of relevant data.