EX-21 2 a2219023zex-21.htm EX-21
QuickLinks -- Click here to rapidly navigate through this document

Exhibit 21

SUBSIDIARIES OF ATLANTIC TELE-NETWORK, INC.

|  | Jurisdiction of Incorporation |  | Other name(s) under which entity does business
--- | --- | --- | --- | ---
Allied Wireless Communications Corporation |  | Delaware |  | Alltel
Atlantic Teleconnection Operating Company Limited |  | British Virgin Islands |  | GTT
Bermuda Digital Communications, Ltd. |  | Bermuda |  | CellOne
Choice Communications, LLC |  | U.S. Virgin Islands |  | Choice Wireless
Commnet Wireless, LLC(1) |  | Delaware |  | Choice Wireless, Commnet
Elbert County Wireless, LLC |  | Colorado |  | Commnet
Essextel, Inc. |  | Delaware |  | Essextel
Mora Valley Wireless, LP |  | Delaware |  | Commnet
NTUA Wireless, LLC |  | Delaware |  | NTUA Wireless
Guyana Telephone and Telegraph Company Limited |  | Guyana |  | Cellink, E-magine, GT&T
GTT International Service SRL |  | Barbados |  | GTT
ION Holdco, LLC |  | Delaware |  | ION
Islandcom Telecommunications, Ltd. |  | Turks & Caicos Islands |  | Islandcom
Sovernet Holding Corp.(2) |  | Vermont |  | Vermont Fiberconnect, Sovernet
DTH Television & Telecommunication NV |  | Aruba |  | Mio
Ohio RSA 6 Limited Partnership |  | Delaware |  | Alltel

(1)
  Includes eight consolidated wholly-owned subsidiaries also providing wholesale wireless voice and data services under the "Commnet" brand name in the United States.
(2)
  Includes three consolidated wholly-owned subsidiaries also providing wireline services under the "Sovernet" brand name in the United States.

QuickLinks

Exhibit 21

SUBSIDIARIES OF ATLANTIC TELE-NETWORK, INC.