There are two speculated reasons as to why we're more bored after taking phone breaks;

•  Switching from work to your phone and back again may end up being more mentally tiring than it is stimulating; and
• Picking up our phones might serve as reminders of all the fun we could be doing instead of doing work-related things.

• Practice mindfulness and drink a hot beverage -- tea, coffee, cocoa;
• Take a walk down the block or in a park;
• Sketch something or doodle;
• Talk to someone -- having a simple conversation with someone you like talking to is a mood booster; or
• Read a book, a coup...