Using Sim card and UART simultaneously on nRF9160dk

Hello,

On nordic nRF9160dk I want to send SMS and receive the data from UART simultaneously. UART needs 3V VDD supply and for Sim card it is 1.8V. So how this condition can be fulfilled at the same time? For now I am using 3V VDD GPIO supply and both are working. But for sim card it is better to use 1.8V, so what is the solution for this?

Thanks,

Jagruti

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