Since the last week, I have been getting random messages from unknown numbers that contain 1kb or so attachments. I didn't think this was a problem until today when saved contacts also started sending me these 1kb files. I talked with them about this and all of them say that they didn't send anything. They have also become much more frequent. Can anyone offer advice on why this is happening and how I can fix this? Please let me know if you need any clarifications. Thank you all!