Smartphones contain many sensors that generate data about the user's surroundings, location, and activity. Smartphones also connect to wearable devices and internet of things devices, acting as a central "artificial brain". This allows smartphones to remotely control devices like TVs and payments through techniques like near field communication. Smartphones are an important part of personal iot setups that monitor health and fitness, and are also used in group applications like smart homes and connected cars to check systems. They play a role in community iot applications through crowd-sourced data collection for smart cities. Industries are also using smartphones for iot like providing personalized retail recommendations and enabling customer profiles.