First, open the phone-Settings menu page and select -SIM card management.
2. You can see that there is a voice phone in the "Default Settings Bar" under the SIM card management page, and voice phone settings can be selected for data connection.
3. Call first —— The voice phone will switch to China Unicom on the popup board. After checking China Unicom, the next call will use China Unicom by default.
4. Also open it first-check Unicom for data connection on the pop-up board. After checking Unicom, the traffic consumed by the next mobile Internet access will be deducted from Unicom's tariff.
Related introduction:
The so-called dual card dual standby means that the same mobile phone has two phone card slots, which can support calls, text messages and other services of two phone cards at the same time. Moreover, it is necessary to distinguish between dual-card dual-standby mobile phones, because although some mobile phones can hold two calling cards, they belong to the dual-card single-mode phone mode, which means that only one calling card can be used, and the other one is always in the standby off state.
From the technical realization, there are several dual-card schemes in the market. One is composed of two chipsets, that is, two sets of baseband chips, RF chips and memory system are installed in the mobile phone, which is equivalent to putting two complete mobile phone motherboards in the same mobile phone case.