Huawei’s Mate-20 5G supports the true 5G core, SA.
Qualcomm is rushing to deliver the X55 5G modem, designed to connect to the true 5G standalone core. Until then, all 5G phones except Samsung and Huawei only support the 4G core (non-standalone.)
They will not be acceptable on Chinese networks after 2019. China has decided that 5G phones must be able to connect to the standalone 5G core, which the X50 does not do. More