When do Americans use their smartphones? Any time they're not sleeping really. As shown by this data from Localytics, a mobile and web app analytics firm, peak hours are after work and dinner around 9pm-10pm. But if you look closely, you can see Americans start giving up on productivity and relapsing to games and entertainment apps around 3pm.
Localytics is measuring smartphone app use as it compares to the busiest hour of the day. Patterns are fairly consistent across app type, except for news apps which are mostly used in the morning before work.
The data looks pretty similar on weekends and weekdays, with the only real difference being that people don't have to wait for the end of the workday to unapologetically use their phones.