Verizon updates Lumia 735 with an HD voice calling toggle
Firmware update for the Verizon’s Microsoft Lumia 735
Verizon Wireless announces a rare firmware update for the Lumia 735 version 02171.00002.15194.03084. The new software update includes only one new feature: the ability to turn on/off advanced voice calling directly on the device.
Verizon’s HD calling can be turned on or off by going to Settings → Cellular → SIM settings → Advanced Calling.
Before you download the update you’d better connect to a Wi-Fi network and charge the phone’s battery.
Source: Verizon Wireless