Why can't I download anything from my Unicom card?

The reason why the software downloaded by mobile phone cannot be applied is as follows: 1. The software is not compatible with the mobile phone system. For example, Apple's mobile phone system is not compatible with general Android software. Please download and install the software compatible with the mobile phone system. 2, the software itself, try to reinstall; 3. The mobile phone system is out of space, so delete the unused software to free up space.