Visit below link For complete step by step guide to call web service in Ionic2 app using Angular2 http://www.icoderslab.com/how-to-fetch-json-data-from-web-service-in-ionic-2-app-using-angular-2/
Visit below link For complete step by step guide to call web service in Ionic2 app using Angular2 http://www.icoderslab.com/how-to-fetch-json-data-from-web-service-in-ionic-2-app-using-angular-2/