Now the B217 version has heard of the B355. I don't know whether it is good to use it. A friend who has used it gives me a suggestion. Do you want to upgrade it?
Building owner, 355 has added the face unlocking function, which makes it more convenient to use (setting ->security and privacy ->face unlocking,It is good to enhance the security of the mobile phone system on the whole. If you receive the push, you can try to backup the data upgrade experience.