According Nadim Kobeissi, an applied cryptographer at Symbolic Software, WhatsApp has totally been blocked off from China users. Before this, Chinese users faced trouble sending out pictures and videos. While today, even text messaging is now completely blocked.
It has been assumed that the blocking of Whatsapp is backed with political reasons as the 19th National Congress of the Chinese Communist Party comes near. WhatsApp may be a target as it provides an end to end encryption that protects and makes users conversations private, at the same time promoting domestic China applications such as WeChat that provides no end to end encryption and provides all information of users to the Chinese Government. Furthermore, it is also a huge blow towards Facebook which owns Whatsapp that has been banned in China since 2009.