Things that smartphones can be used for:
to communicate, to pay, to take photos, to tell time, to set an alarm, to plan a route, to listen to music/podcasts, to watch a video, to look up words, to keep track of your physical exercise, to follow a diet, to calculate, to check the weather forecast, to check timetables of public transport, to scan barcodes or QR-codes, to identify music, …… .