Receive blank sms messages regularly from this number. Not sure whether contains any virus or not

I recieved an SMS saying somthing about claiming pairs of glasses from this number. It then said to send the word unsubscribe to another number and because I was litterally just woke up I wasn't thinking and sent the word *unsubscribe* to that number. My number is only a week new, not sure how they got my number, and I'm hopings its not something virus.

just received a multimedia message that I have no intention of trying to open

I've just received a Multimedia Message that won't open, too

I was sent a mms that would never open.

This person kept sending me attachment which I suspect might be a virus.