Lex Friedman discovers a solution for a problem discovered by Ars earlier this week that would allow iMessages to be sent to your iPhone even after it had been wiped:
Macworld can confirm that perhaps the easiest way to ensure that a stolen phone stops receiving iMessages is to remotely wipe the phone, and then call your carrier and instruct them to deactivate your old SIM. The third and final step? Activate a new SIM in your new phone. Completing those three steps—wiping, deactivating your old SIM, and then activating a new one—ensures that your iMessages will get sent only to you and your iOS devices, and not anywhere else.