Serial COM Port Communication in Xamarin

Hello Everyone,

I want to connect any device to my mobile phone by using micro USB or Bluetooth. Then, I want to see COM Ports on my mobile phone.
I examined these topics( System.IO.Ports System.IO.Ports.SerialPort ) for this problem. But, I can't use these namespace and class in Xamarin.

Are there anyone who have idea for this problem?

Thanks.