In Issue #13, I mentioned installing and using Network Link Conditioner on OS X to simulate a slow and unstable network connection.
iOS has a similar functionality. If you haven't, you'll need to plug in your iOS device to your Mac and go to Xcode and mark the device as "Use for Development". After that, when you open Settings.app on your iOS device, you'll see that there is a "Developer" menu between the social network accounts and other app settings. Tap "Developer" and you'll be able to configure Network Link Conditioner. Now you can run the same test on the actual device.