Basically whatever you want to download, the app will pop out a warning saying your phone does not have enough capacity (with over 10G space left on the phone, my case) and then whatever you press on the screen now will proceed you to download another app to clean your phone. I didn't proceed any further, But I do want to remind anyone who wants to try to proceed.... Don't be fooled, there are bunch of CLEANUP apps out there're proved steal data from your phone. You can simply clean up your phone by yourself. AND no matter how much space you have on your phone, this app will ask you to download that cleanup app anyway, so....you could tell, I'm done with them. I will give 0 star if there's such an option.