Hi, I am using the HTC Desire Z and am very interested in finding out where my apps go when I download them, hence I recorded information about my phone using the app called 'Android System Info' before and after downloading an app. Let me put the data here. App used: Angry birds - seasons 2.05mb Stored on SD card Before installing 'Angry birds - seasons' Internal memory: 946.97/1150.45mb SD card: 6453.65/7572mb After installing 'Angry birds - seasons' Internal Memory: 944.34/1150.45mb SD card: 6435.34/7572mb After deleting 'Angry birds - seasons' Internal Memory: 946.4/1150.45mb SD card: 6453.65/7572mb This has made me very confused as downloading the app took up space in both my internal memory and SD card even though it only said that it would be stored on my SD card. Even then, it should only take up 2.05mb in my SD card, which was not the case as it took up 18.31mb, much more than 2.05mb. Another thing is, deleting the app did not remove the app totally from my internal memory, as seen from 946.97 decreasing to 946.4. 1) When the app says 'stored on SD', why is it stored on both phone and SD? 2) When the app says 2.05mb, why does it take up 18.31mb instead? 3) After I've deleted the app, why is it not totally removed from my phone's internal memory? Thanks for your help.