So my friend keeps sending these blank iMessage texts (look at pictures). It's not an iMessage bug cause he can do it as many times as he wants. Specifically what happens is that I get the notification, it makes he sound and everything but the notification is blank, and when I open it, it doesn't show that he sent anything! I'm not sure how he does it. He doesn't wanna tell me and it's really pushing my buttons. Do you guys know how he does it ?
Here is the link to the pictures:
https://m.imgur.com/a/xn8a1
In the second picture showing our conversation, he is doing his little trick but it doesn't show that he is sending messages, how can this be??