The 2015 Mobile World Congress highlighted key themes including major device launches, the Internet of Things (IoT), wearables, and personalized consumer experiences using big data. Notable device announcements included Samsung's Galaxy S6, HTC's One M9, and LG's Urbane LTE smartwatch, while the discussions around IoT showcased connected cars and smart cities, although meaningful interconnectivity is still lacking. Additionally, advancements in adtech, privacy, and security were addressed, emphasizing the need for better data management and user privacy protections in an increasingly connected world.