Who called from 7049721960

I got several calls from this number and no one is ever on the other line and it disconnects 10 seconds after I answer....anyone know what this is?

Mecklenburg county Jail   CHARLOTTE NC

called 14 times, and didnt answer wierd.

If you want to be able to receive this call you have to set up a plan (purchase phone minutes) from a company called Advance Pay 800-483-8314.

This number called about 8 different times.  no one on the other line.  This was after midnight, between 12 am-3 am.  worried us.  I Called our phone company--it seems to be spam. When calling back it provides an automated/robot msg saying to call customer service with a code of SC01-65.