I download lots of apps and I am always using my iPhone 4. I recently noticed how sluggish my phone had become over the last few months. I was about to do a fresh restore until I came across the app XSysInfo. This app cleans and deep cleans your iPhone or iPad memory back to the point where your device works just as fast as it did the day you got it. Here is the link http://itunes.apple.com/us/app/xsysinfo-device-booster/id354129029?mt=8 and the cost is $1.99 Let me know your results.