What do Unicom and Tower Company mean by 9+4?

Unicom and Tower Company 9+4 means * * * to build * * * to enjoy. * * * Architecture * * is the mission of China Tower rooted in genes. China Tower and telecom enterprise * * * are working together to further deepen the construction of communication infrastructure, continuously expand, deepen and optimize * * *, and accelerate the construction of 4G and 5G networks.