UltraTone Connect 对比 BlackCryptoPhone 的使用情况和统计数据

UltraTone enables you to make free VOIP or low cost international calls over the internet, utilizing either WiFi or 4G connectivity and leveraging the high-speed potential of 4G/5G technology. The 'Callback Request' feature ensures that you can place crucial calls even when your internet connection is unstable, offering a cost-efficient alternative to traditional calling methods. On average, UltraTone is 80% less expensive compared to calls made using a SIM card. Additionally, it delivers superior and faster connections, providing much clearer audio quality during calls.