Exhibit 21.1

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Exhibit 21.1

USA Mobility, Inc. and Subsidiaries

Legal Entity Chart with Federal EIN

USA MOBILITY, INC.

16-1694797 P

Arch Wireless, Inc.

H 31-1358569

Paging Network

Amcom Software, Inc. USA Mobility Metrocall Ventures, Inc. Canadian

41-1495313 O Wireless, Inc. 54-2061968 Holdings, Inc.

0 91-1199104 H H 75-2590360 10%

Madison Telecommunications

Amcom Software Pty Ltd Holdings, Inc.

(Australian Corp) O 100% GTES, LLC CO(Canadian)

98-1031327 80-0139231

Paging Network

GTES, Inc. of Canada, Inc.

CO(Canadian) CO(Canadian)

Amcom Software Middle

East, Inc.

30-0739267 O

P – Parent Company

H – Holding Company

O – Operating Company

CO – Canadian Operating Company