Final answer:
Bluetooth is the technology that enables hands-free phone calls while driving, complying with Saul's city regulations. It uses short-wavelength UHF radio waves to connect devices like headsets to phones.
Step-by-step explanation:
The technology that would be helpful in allowing Saul to talk on the phone hands-free while driving is Bluetooth. Bluetooth is a wireless technology standard for exchanging data over short distances (using short-wavelength UHF radio waves) from fixed and mobile devices, creating personal area networks. It allows for a hands-free headset to be connected to a phone, which is perfect for situations where hands-free phone calls are legally mandated while driving. This technology has evolved due to improvements in wireless technologies that also include microwave transmission and communications satellites, greatly enhancing mobile communication.