I wear mine to track my sleep after I downloaded a sleep app from Apple App Store. Battery last me about a day and a half. I use my phone for most things, but do send message and receive replies plus track my bike or walk activity. I did turn off feature that shows time when you lift your arm and just push stem dial to check time or check an app. I also use it to check heart rate. I don’t read my email unless I forget my phone ——I have LTE version but try not too use that feature too much— just use mostly messaging.