Trying to call a static method to use as Desired Capabilities

Im trying to call some desired capabilities from a static method and use these to open an online emulator but i cant seem to figure out how to get it to work.

public class config {
 public static final DesiredCapabilities desireCapabilitites_iphone7(){

    DesiredCapabilities capabilities = new DesiredCapabilities();
    // The generated session will be visible to you only.
    capabilities.setCapability("sessionName", "Automation test session");
    capabilities.setCapability("sessionDescription", "");
    capabilities.setCapability("deviceOrientation", "portrait");
    capabilities.setCapability("captureScreenshots", true);
    capabilities.setCapability("browserName", "safari");
    capabilities.setCapability("deviceGroup", "KOBITON");
    capabilities.setCapability("deviceName", "iPhone 7");
    capabilities.setCapability("platformVersion", "12.1.2");
    capabilities.setCapability("platformName", "iOS");

    return capabilities;
}

Im trying to call this into a test but i keep getting the "cannot resolve constructor" error.

public class invalid_url_test {

    public static RemoteWebDriver driver = null;


@BeforeClass
public void setup(){


    String mobileServerUrl = "https://urllogin.com/wd/hub";
    driver = new RemoteWebDriver (mobileServerUrl, config.desiredCapabilitites_galaxys9());



}

Im using selenium and its written in java, I tried changing it to androidDriver but dont think it will work correctly with an android driver, ive also tried making the RemoteWebDriver private but still cant get it to work.