Bkav bất ngờ tung OTT, chất lượng cuộc gọi tốt hơn Viber?
Công ty An ninh mạng Bkav đã bất ngờ tung ra Btalk- ứng dụng nhắn tin, gọi điện miễn phí trên nền Internet (OTT) lên chợ ứng dụng Google Play mà chưa công bố chính thức.
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