How can I get better call quailty?

Call quality is primarily determined by the condition of the network your device is using. To transmit a high-quality voice call, Dingtone requires a stable network connection between your device and our server. If your device connects to a WiFi network, please move close to the WiFi hotspot since WiFi has a very limited transport range. Please avoid making calls on a public WiFi (these are typically slow). If your device connects to a 3G/4G network, 3 signal bars are required.