How to make iMessage not be delivered?

Is there a way on an iPhone so that when someone sends you a message on iMessage it doesn't say delivered underneath it so it looks like you have no signal or your phone is broke?
For example, sometimes when I send my sister an iMessage it doesn't say delivered it just sends as an iMessage with nothing underneath it

Maybe you didn't activate imessage in settings or it could be that the other person didn't have imessage turned on or they turned it off. Or, the Wi-Fi connection isn't working. I'd check the wireless router and cable modem. If it is the cable modem, reset the cable modem.