I just bought an iPhone 7 plus, and since I started using it, I keep getting this annoying message at all hours of the day: REG-RESP?v=3;r=1849759488;n=+4799404842;s=025AAC01CDFFFFFFFF217C134C22FB31FFD275 It comes from a hidden number, and several hours of Googling has told me that this is a message in connection with iMessage. Supposedly it is an iMessage from Apple that went wrong somehow. It is not blockable. Now, how do I stop this message from coming to my phone every 2 hours or so? I have deregistered my phone number at Apple, iMessage and Facetime are OFF. Still this message keeps coming to my phone. It even comes to my Samsung work phone where I have the same number. I need help. I just can't go on getting this message all the time. I will end up having to sell my iPhone 7 if I can not get a solution for this. Any suggestions?