One card, three networks, free switching, and dual-card dual-standby mobile phones are familiar to everyone. This function has existed since the functional machine era. Now in the world of smart phones, the dual-card dual standby function has no scientific content, but now there is a distinction between dual-mode and single-pass dual-pass.
One card, three networks, free switching, one pass, or dual card dual standby. The biggest difference between a one-way phone and a two-way phone is that a number cannot be connected when answering or making a call.
Efficiency competition of free switching of one card and three networks;
When one card and three networks are freely switched, the balance between efficiency and competition can be solved. Yang Fan, a telecom consultant of Bofeng, a research institute in China, pointed out that when different networks are interconnected, there will be network externalities. Because the vast majority of online information sources are distributed in the network of operators mainly based on the Internet.
Free switching of one card and three networks In the interconnection between different networks, it is necessary to formulate relevant standards and make overall plans, especially the interconnection between Internet backbone networks, to ensure the communication quality between the Internet and truly realize interconnection. He pointed out that these rules and standards should not only include the planning of the Internet network framework.