Sources: Huawei recently told some clients that a large share of its upcoming flagship, Ascend 960DT, will run largely on HBM made by Samsung and SK Hynix (The Information)
https://www.theinformation.com/articles/smugglers-get-expensive-memory-chips-china-south-korea
http://www.techmeme.com/261102/p50#a261102p50