| All-Ways Communications, LLC | - | Hagerstown, MD | Inactive |
| Allsafe Security Service, Inc. | - | Jacksonville, FL | Inactive |
| Alpha Display Paging, Inc. | - | St. Louis, MO | Inactive |
| Alpha Message Center, Inc. | - | Northfield, NJ | Inactive |
| Alpha Page, Inc. | - | Green Bay, WI | Inactive |
| Alternative Communications Source, LLC | 17 Sound & Cellular | Paramus, NJ | Active |
| Always Answering Service, Inc. | - | Hagerstown, MD | Active |
| Alybren Services, Inc. | Mail Call | Los Angeles, CA | Inactive |
| AmMex Communications, Inc. | Easycomm Beepers, Inc. | Cabin John, MD | Inactive |
| Amarillo Digital Paging, Inc. | - | Amarillo, TX | Inactive |
| Amarillo Telephone Co., Inc. | A-1 Communications | Lubbock, TX | Active |
| American Communications Network, Inc. | Americom | Greenville, SC | Inactive |
| American Installation Co., Inc. | NationLink Wireless | Franklin, TN | Active |
| American Messaging Service, LLC | - | Lewisville, TX | Active |
| American Page One, Inc. | American Mobil | Montgomery, AL | Inactive |
| American Tele-Communication Systems, Inc. | - | Wayne, NJ | Inactive |
| Anser-Quick Enterprises, Inc. | - | Morehead City, NC | Inactive |
| Anser-Quick of Kinston, Inc. | - | Morehead City, NC | Inactive |
| Anserphone of Natchez, Inc. | Answerphone of Natchez, Inc. | Natchez, MS | Inactive |
| Answer Fort Smith, Inc. | - | Fort Smith, AR | Inactive |
| Answer, Inc. | - | Corpus Christi, TX | Active |
| Answerphone Services, Inc. | Direct Page Communications | Elmira, NY | Inactive |
| Antietam Answering Service, Inc. | - | Hagerstown, MD | Active |
| Apple Beeper Co. | - | Iselin, NJ | Inactive |
| Applied Technology Group, Inc. | - | Bakersfield, CA | Inactive |
| Aquis Wireless Communications, Inc. | - | Parsippany, NJ | Inactive |
| Arch Connecticut Valley, Inc. | Arch Paging, Inc. | Westborough, MA | Inactive |
| Arch Wireless Holdings, Inc. | Arch Wireless Holdings, Inc | Westborough, MA | Inactive |
| Arch Wireless Operating Company, Inc. | Arch Wireless | Westborough, MA | Inactive |
| Arkansas Photo Supply, Inc. | ACCUPAGE | Blytheville, AR | Inactive |
| Aroostook Paging, Inc. | - | Westbrook, ME | Inactive |
| Aspen Messaging, Inc. | - | Prior Lake, MN | Active |
| Athens Business Communications, Inc. | - | The Plains, OH | Inactive |
| Atlas Mobilfone, Inc. | - | Springfield, MO | Active |
| Audio-Video Corporation | A-1 Communications | Amarillo, TX | Inactive |
| AudioLand | - | San Diego, CA | Inactive |
| Aulds And Garner Tele-Com Services, Inc. | - | Houston, TX | Active |
| Auto Cellular Systems, Inc. | AirPage | Encino, CA | Inactive |
| Auto Dial, Inc. | - | Weatherford, TX | Inactive |
| Autopage, Inc. | - | Texarkana, TX | Inactive |
| Awesome Paging, Inc. | - | Victoria, TX | Inactive |
| Azcom | - | Phoenix, AZ | Inactive |
| B & C Mobile Communications, Inc. | Colorado Mobile | Lamar, CO | Active |
| B & M Communications, Inc. | - | tupelo, MS | Inactive |
| B.R. Alternative Investments, Inc. | - | Waterbury, CT | Inactive |
| BCI Corporation | American Beeper | Mishawaka, IN | Active |
| BGN Enterprises LLC | Americom | Waycross, GA | Inactive |
| Baker\s Electronics & Communications | Inc., Baker\s Electronics & Communications, Inc. | Lake City, FL | Active |
| Basin Communications Systems, Inc. | - | Odessa, TX | Active |
| Bay Star Communications, Inc. | Bay Star Satellite Paging | Tomball, TX | Active |