Unlike the majority of other smartphones, the Vertu Signature for Bentley—the second handset developed by the high-end phone manufacturer in its five-year partnership with Bentley—does not feature a touchscreen. Instead, the voice-centric phone includes a traditional alphanumeric keypad and a screen protected by scratch-proof sapphire, the second-most-durable natural material in the world. The Signature provides top-notch call quality, while side-mounted speakers ensure optimal sound. Many of the design notes …