Root permission is required to have root privileges anything you can delete in your phone, including your phone system.
In general, mobile phone pre-installed software can be divided into manufacturers pre-installed and brush machine pre-installed two major categories. Since the price of smartphones is falling, it is hard to make money from hardware, so pre-installed software for application developers has become a new source of revenue for handset manufacturers, operators and chain stores.
So, the first is a commercial problem, the implantation is simple and can make money. As a result, many pre-installed software has been set to fail to unload at the factory.
At the technical level, there are already some mobile software that can help users get root privileges and eliminate some of the pre-installed software that is not in use.
But some pre-installed software is with ROM (read-only memory, the feature is that once the data is stored, it can no longer be changed or deleted, usually in an electronic or computer system that does not need to change data frequently, and the data is not lost due to power off. This pre-installed software is not not able to uninstall, but once unloaded, It is possible to not open the machine.