红鱼儿的博客
 //引用单元:FMX.PlatForm, FMX.PhoneDialer
procedure TForm1.Call(ANum: String);
var
  PhoneDialerService: IFMXPhoneDialerService;
begin
  if TPlatformServices.Current.SupportsPlatformService(IFMXPhoneDialerService,
    IInterface(PhoneDialerService)) then
    if ANum <> ‘‘ then
      PhoneDialerService.Call(ANum);
end;
    这里使用的SupportsPlatFormService会返回PhoneDialerService实例!
原文:http://www.cnblogs.com/westsoft/p/5940563.html