How can I tell if my messages have been sent/delivered/read?

How can I tell if my messages have been sent/delivered/read?

There are 3 icons to indicate the status of a message:

  • 1) One Grey Checkmark: the message has been sent, but is not yet delivered to the recipient's device
  • 2) Two Grey Checkmark: the message has been delivered to the recipient's device but not yet read 
  • 3) Two Blue Checkmark: the message has been read by the recipient

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