Default [Q] 4G LTE

Hello, I'm thinking to buy this phone, but I have a question:
is 4G available for the first SIM?
I read that 4G is available for China's frequency, but I don't know if there are the same to Italian frequency or not.
I want a phone dual sim with 4G-LTE support for the first sim and I don't find another phone.
Can you help me?
Thanks at all.