ZLT S25 is a high-performance wireless communication product developed by Hongkong Broadvision Technology Co., Ltd based on 4G network requirements. It is mainly used for voice (VoLTE/VoIP/CSFB) services & data transmission services, equipment monitoring, wireless routing and other functions. ZLT S25 adopts high-performance processor, which can process protocol and large amount of data at high speed. It can be used with a variety of 4G CAT4 module, providing 802.11b/g/n Wi-Fi access.
Even though its branded Airtel, its decoded to support all network sim cards.