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The sleeping data is automatically synchronized to the Smart Wristband App on your phone when it is connected to Bluetooth. You can check the progress there.
You can view part of the message when you just receive a text, just touch the screen to read the entire text.
Just receive and view, can't reply.
You might not activate Notifications for them yet. Go to Phone Setting - Notification and Allow Notification for Messages and Facebook.
Yes , It fits most sizes .