Received a call from this number 10 mins ago. I didn't answer nor they did leave a voicemail. It has been blocked and I recently have been receiving calls all with the same first 3 digits: 799. Other numbers were:

773-799-4985
773-799-2790
773-799-3211

I just would like to know who these people are and why do you call at odd times and not leave a voicemail. No voicemail and not a contact, not important in my book and won't answer. Stop calling!