Call/Customer Service Center

Avertech, Inc.
600 N Derby Ln, Ste 1A
North Sioux City, SD 57049

Call center for IT support

952-484-8844
Diversified, Inc.
600 N Derby Ln
PO Box 230
North Sioux City, SD 57049

Telemarketing of phone service

605-242-5100
605-242-5138
Lawrence & Schiller Teleservices
301 Centennial Dr
North Sioux City, SD

Inbound/Outbound customer service

6052321023
Maaske Marketing
600 N Derby Ln
North Sioux City, SD 57049

Phone Business Services

605-242-5102
605-242-5101