We all use a speed test utility from time to time, to diagnose connectivity problems. I always use speedtest.net. They have had an iPhone app for a while now, but today they updated it to 2.0.1. Along with some tweaks to get it to work better with all iDevices including the iPhone 4, They have revamped the entire interface, making it retina display worthy. Actually I think this is the best looking app so far on the retina display. If you have an iPhone 4 and want to see a great graphical interface, and also want to be able to test your internet connection out, the app is free on the app store.