Received a strange blank message,

O(∩_∩)O~, it may be your relative or friend. Remember your number. When the keyboard of the mobile phone is unlocked, any key you touch will send a message, and it will be blank. I've been in the same situation as you before. Finally, my uncle just bought a Nokia phone, and he doesn't know how to use it. After pressing the middle button several times, a blank message was sent to the first number. I guess yours is the same. Let's call and ask. Maybe it's your family