Apple Mobile Phone Dual Card Use Tutorial

Apple mobile phone dual card dual standby setting method is as follows:

Mobile phone: iPhone 1 1

System: IOS 13.6

Software: Settings 7.0.2

1. First open the mobile phone, click Settings, then select Fengwo Network to enter, and click any mobile phone number to select.

2. Then go back to the previous page, click the default voice number and set another number.

Dual card dual standby is a new term in the mobile phone industry. Dual card dual standby means that a mobile phone can insert two mobile phone cards at the same time and stand by. Simply put, consumers can use two GSM network phone numbers on a mobile phone and two CDMA network phone numbers on a mobile phone.

The principle of dual card and dual standby

From the technical realization, there are several dual-card schemes in the market. One is to use two sets of chipsets, that is, the mobile phone is equipped with two sets of baseband chips, RF chips and memory system, which is equivalent to putting two complete mobile phone motherboards in the same mobile phone case. This implementation can support two SIM cards to work at the same time, and there is no need to switch on and off again when switching.

One is to add an analog switch to the traditional mobile phone chipset and manually switch the network. The latter is usually the implementation of dual-card single-standby mobile phone. However, some enterprises later used it in dual-standby mobile phones, which were prone to problems such as incompatibility with various SIM cards and immature control software, resulting in a high drop rate.