Hey Siyanda, this can also happen if the app you are trying to install is larger than what the system expects. Remember that most apps default to the internal memory when installed and only few will install onto the SD card until you are rooted. You may have a completely empty 8GB SD card and still receive the low disc space, insufficient space, insufficient storage, etc error message. You want to consider rooting your Mobicel Vivo in order to permanently overcome the limited space issue. With root right, you can use an app called 'LInk2SD' to take advantage of the SD card storage for to keep certain downloaded apps.