This document discusses location-based mobile advertising. It describes types of location-based ads like display, message, and search ads. It notes that location-based ads work best for local and relevant offers, but require user opt-in to track location. On average, 30% of users opt-in, with rates as high as 35% for Android users. Examples are given of successful location-targeted campaigns by Yellow Pages and McDonald's that saw click-through rates 2-4 times higher than non-targeted ads. Location-based messaging is also discussed as having potential due to low opt-out rates below 2% and proven ability to generate store visits and transactions.