- City / exchange
- Keystone
- Province / state
- South Dakota
- Country
- United States
- Carrier
- Fort Randall Telco dba Mt Rushmore Telephone Co
- Line type
- Landline or business line
- OCN
- 1660
- Status
- In Service
- Number pooling
- No
605-666 phone numbers
Keystone, South Dakota, United States · Fort Randall Telco dba Mt Rushmore Telephone Co
Reported numbers in 605-666
No numbers in this block have been reported by visitors yet.
What does the 605-666 prefix tell you?
Every North American number is area code + prefix + line. The prefix 605-666 was assigned to Fort Randall Telco dba Mt Rushmore Telephone Co on an unknown date for the Keystone exchange. A call from this block usually originates from a Fort Randall Telco dba Mt Rushmore Telephone Co customer in or near Keystone, but caller ID can be spoofed to show any number.