Is Nubia Z17 dual-SIM dual standby?

It is dual card dual standby.

1. Dual SIM dual standby

Dual SIM dual standby is a new term in the mobile phone industry. Dual SIM dual standby means that the mobile phone can insert two mobile phone cards and can be on standby at the same time.

To put it simply, consumers using GSM dual-card dual-standby mobile phones can use two GSM network mobile phone numbers on one mobile phone at the same time. Using CDMA dual-card dual-standby mobile phones, they can use two GSM network mobile phone numbers at the same time. CDMA network mobile phone number.

Dual-SIM dual-standby mobile phones can generally be set to the following situations: 1. Only SIM1 card is enabled; 2. Only SIM2 card is enabled; 3. Dual-SIM card is enabled. With dual-SIM dual-standby mobile phones, busy people no longer need to hold two mobile phones in their hands, which is simple and convenient.

2. Principle

From the perspective of technical implementation, there are several dual-card solutions on the market. One is to use two sets of chipsets, that is, the mobile phone is equipped with two sets of baseband chips, radio frequency chips and memory systems, which is equivalent to two complete mobile phone motherboards put together in the same mobile phone casing. This implementation method can support two SIM cards to work at the same time, and does not need to be turned on and off again when switching. However, the problem is that its cost is almost twice that of ordinary mobile phones, and its power consumption is often twice that of ordinary mobile phones. Many bulky dual-SIM dual-standby phones on the market use this solution. One is to add an analog switch (Analog Switch) to the traditional mobile phone chipset to manually switch the network. The latter is usually the implementation method of "dual-SIM single-standby" mobile phones, but later some companies also used it in dual-standby mobile phones. As a result, it is prone to problems such as incompatibility with various SIM cards and immature control software. The line rate is very high.

"The principle of the current dual-SIM dual-standby single-pass solution is to use a control IC (chip) to continuously switch between the two networks through software and automatically search for the network. Since the switching time is very, very short , such as a frequency of one thousandth of a millisecond, consumers cannot feel that a network switch has occurred, which is equivalent to realizing that two cards are on standby at the same time. "If one card is making a call, the other card is receiving a call. In addition, the software also sets up a way to send a text message to notify missed calls. From the consumer's point of view, no calls will be missed, which is no different from "dual standby".