With the rapid development of information society, mobile phones have gradually become an indispensable part of life. When the mobile communications develop to a certain extent, many people expect to own or have owned a number of mobile phone numbers, especially for business men who are eager to carry multiple telephone numbers on their Lacoste Polo Shirts cell phones since they often need to travel and switch SIM cards. In accordance with the needs of the market, mobile phone can support two SIM cards at the same time, on which two cards can also dual-card dual standby appear. Dual card dual standby mobile phone can provide users with more convenient, intuitive, user-friendly personal communication services.During the early period dual-card mobile phone is discount wedding dresses able to be inserted two SIM cards at the same time, but only one card is active. Their switch is achieved by hardware circuits chosen at the boot time generally. Two SIM cards can not be lace wedding dresses switched dynamically during general state of the work for the impact of protocol stack. That is, each switch will need to restart the phone system. This mobile phone is often referred to as dual-card single question phone.Then a true dual-card dual-standby emerges which has two systems, namely, two sets of cheap wedding gown dresses radio frequency (RF), two sets of base-band (Base Band) and two sets of protocol stacks at the same time .One of its most prominent feature is that cell-phone numbers on the same phone can call each other. This is the necessary condition determining whether the mobile phone is the dual-card double question or not.However, two systems on cell phone lead to high-cost, 12hot cheap prom dresses high-power, high complexity and cheap evening dresses larger size which become bottleneck for the development and popularity. Via continual improvement, the mobile phones run only a system and share a set of base band, a radio frequency co-ordination of the dual-card dual-standby are produced.
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