To help make sure your message gets noticed, mark it as important or urgent.
To do this, select Set Delivery Options 
beneath the compose box, and then select Important or Urgent.
This adds the word IMPORTANT! or URGENT! to your message. Once in the message, you can include files, links, or pictures—whatever is needed to get your point across.
To undo this option, select Standard from your delivery options, and the message will be sent as usual.
An urgent message notifies a person or group repeatedly, every 2 minutes for 20 minutes, or until they read it. You’ll need to decide what messages are urgent based on your organization or group.
Note: If you don't see the option to mark a message as urgent, it may be because there are more than 20 members in your group chat. Also, your admin must enable urgent messages. Important or urgent message options aren’t available when you start a chat with yourself.
To help make sure your message gets noticed, mark it as important or urgent.
To do that, tap More options 
> Message priority, and then select Important or Urgent. This adds the word IMPORTANT! or URGENT! to your message. Then compose your message.
To undo this option, retrace your steps and tap it again.
An urgent message notifies a person or group repeatedly, every 2 minutes for 20 minutes, or until they read it. You’ll need to decide what messages are urgent based on your organization or group.
Note: If you don't see the option to mark a message as urgent, it may be because there are more than 20 members in your group chat. Also, your admin must enable urgent messages.
