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UART is abbrevation for Universal Asynchronous Receiver/Transmitter.
Dual sim phone usually need to set up UART. You can choose Sim1 or Sim2.
when the phone is dual sim cards*dual standby: if you choose Sim1* then Sim1 may have more functions than Sim 2. For example* some phones do not support dual blueteeth* and at that time only one card can own this function.
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