Who called from 7734309577

Called my cell phone at 7:30 AM.  I tried calling back and got a generic 'mailbox is full'  message.  I'm blocking them.

Called my cell, left a blank 5 second voicemail.

Just received a call on my cell phone. And like the others I don't know anyone with that number.  I'm blocking them too.

Called my cell at 12:00 pm. Caller ID shows the number and Chicago IL. I answered, an auto voice said "that extension is not valid", and hung up. I called back, it's a non-working number. Definitely a candidate for blockage.

Called and left no message.