abstract class Telefono {
    public void call();
    public void callerID();
    public void sms();
}

public class Nokia3210 extends Telefono {

}

public class iPhone6 extends Telefono {
    public void startiOS();
    public void camera();
    public void siri();
    public void iCloud();
    public void mms();
    .
    .
    .

}

public class Nexus6 extends Telefono {
    public void startPureAndroid();
    public void camera();
    public void googleNow();
    public void googleCloud();
    public void mms();
    .
    .
    .

}

public class S6 extends Telefono {
    public void startCustomAndroid();
    public void camera();
    public void samsungCloud();
    public void touchWiz();
    public void mms();
    .
    .
    .

}