Sound and Connectivity
The VK520 was designed without a loudspeaker or a 3.5mm jack, requiring users to rely on its basic vibration and downloadable polyphonic ringtones for alert and call notifications. The absence of Bluetooth, WLAN, or any advanced connectivity options underscores its focus on basic telephonic communication. There was no support for a radio or positioning systems, reflective of its intended role as a fundamental mobile device.