Possible Clues:

• Motorola Razr, e.g., and a hint to each set of circles
• The Motorola Razr, for example
• Retro communicator
• Communication device also called a clamshell
• Fast-fading technology...or how to fix three of this puzzle's answers?
• *Samsung or LG product
• Motorola Razr, e.g
• Nokia option