I am using a Huawei y210d, and when I try to install any app, after downloading I get an insufficient space warning. Can anyone tell me how I can solve this problem?
um....free up space? "insufficient space" means that the memory on your device is running out; to download an app (which actually does take up memory!) you need to uninstall some other apps, or delete some pictures/video from the memory.
Alternatively, you might want to look into getting an SD card for external memory, and either put apps, videos, or both on the card, which would help prevent this from being an issue in the future.