Nuisance calls, appear to be originated by someone using a robo dialing program. Repeatedly calls never leave a message, highly suspect they have a dubious agenda. Do not trust, potential for fraud.
878-205-1021 shows up as a missed call in my cell phone 7/26/17. No voice or texts from this or any other number. A local Facebook flea market page now has a thread going about a rash of robo calls from foreign scammers who've set up spoofed caller ID names & numbers to deliberately appear to be a local call.