Related Clues:

• Merged comm. giant
• Bell Atlantic + __ = Verizon
• Erstwhile phone company
• Bell competitor, back in the day
• Former pharmaceutical giant
• Verizon, before
• Pioneering cell phone co.
• One-time AT&T rival
• Old AT&T rival
• Former phone co.
• AT&T rival, once
• Telecom co. of yore
• Onetime AT&T rival
• Old inits. in telecommunication
• Erstwhile telecom company