Related Clues:

• AT&T, for one
• Verizon, for one
• 45-Across, e.g.
• Verizon or AT&T
• Communications business, shortly
• MCI, for example
• Sprint, for one
• Phone service util.
• Verizon, for example, for short
• Verizon, e.g
• Sprint, e.g
• The Bell System was one, briefly
• AT&T, e.g
• Big-time phone company
• AT&T, briefly