I've just got my first Android phone (Galaxy S7) and so am still learning the ropes.
Occasionally, when I am using the phone, it will vibrate quickly twice, like I am receiving an SMS. However, there's is no visual information along with the vibration.
I thought it might be reminding me of unread messages, but this happens regardless. This also does not happen when the phone is locked, but does happen whilst I'm using other applications, like games, am on the home screen, or immediately after I unlock.
Would anyone know what my phone is trying to tell me?