Why doesn't the mobile phone display the twelfth lunar month and the zodiac, and for how many years?

You need to set up a plug-in or applet on the mobile phone desktop to display lunar calendar and zodiac information.

Some mobile phones have this small plug-in. You can enable this plug-in in the display configuration in the phone settings, or you can press and hold the phone desktop, and then the desktop plug-in configuration option will appear at the bottom of the phone. Some mobile phones don't have this plug-in. You can search for an APP of this kind from the software mall, download it and install it on your mobile phone for display.