The Call method makes phone call to a number.

 app.Call( number );

function OnStart()
{
	//Create a layout with objects vertically centered.
	lay = app.CreateLayout( "Linear", "Vertical,VCenter,FillXY" );	
 
	txt = app.CreateText( "Please type phone number to call:", 0.5, 0.05 );
	txt.SetMargins( 0, 0.05, 0, 0 );
	lay.AddChild( txt );
 
	edt = app.CreateTextEdit( "", 0.5, 0.08, "Number" );
	edt.SetMargins( 0, 0, 0, 0.05 );
	edt.SetBackColor( "#333333" );
	lay.AddChild( edt );
 
	btn = app.CreateButton( "[fa-phone]  Call", 0.5, 0.1, "FontAwesome" );
	btn.SetMargins( 0, 0.05, 0, 0.05 );
	btn.SetTextSize( 20 );
	lay.AddChild( btn );
 
	//Set function to call when button pressed.
	btn.SetOnTouch( btn_OnTouch );
 
	//Add layout to app.	
	app.AddLayout( lay );     
}
 
function btn_OnTouch()
{
	app.Call( edt.GetText() );
}