How to add and call wcf service in pcl project xamarin forms?

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C#

Xamarin

WCFServices

I have Xamarin forms cross platform project and I need to call WCF web service in PCL project but I am not able to add web service in PCL project. The code below is tried for windows phone application because I am able to add same WCF web service in that project.

What I have tried:

ServiceReference1.Service1Client client = new
ServiceReference1.Service1Client();
string returnString;

returnString = client.GetData(textBox1.Text);
label1.Text = returnString;