Welcome to Android Central! From the specs, I see that the Y220 actually only has 512 MB of usable internal storage ROM, which is where apps are installed. The 4 GB that you mention are presumably from an external microSD card, which is not helpful when it comes to downloading and installing apps. See this guide for more info and tips: http://forums.androidcentral.com/am...roid-memory-how-deal-low-memory-warnings.html