Usually network providers promise high-data downlink and uplink speed on 3G/4G networks at premium price plans, but rarely are those speeds witnessed. Well, the perfect solution for testing the actual upload and download speed is Speedtest.net. This is undoubtedly the most comprehensive network speed tester available. Made by Ookla, the developers are big-players in the broadband world and lead in web-based network diagnostic applications. The accuracy with which the service throws results, on smartphone as well as web, is really app-laudable to a great extent.