Express information is based on VOIP technology, which combines the advantages of saving money of SIP network technology and high quality of fixed-line communication. It is a popular mobile phone network phone in the market at present.
Principle: Through the internet access function of the mobile phone, through this money-saving mobile phone software, connect to the corresponding mobile phone number segment to realize the call. Therefore, this is obviously different from the traditional VoIP. With this software, the network traffic used is only fixed at 1 kb, no matter whether you call1min or call 100 min continuously.