There is a strange number in Xiaomi SMS synchronization management.

This situation may be that this stranger was your contact before and you deleted him.

There is an unknown mobile phone number in SMS synchronization management. This situation may be that this stranger was your contact before, and you deleted him, because the SMS number did not show the name and became a strange number.

Mobile phones are synchronized to the cloud, and the cloud generally includes address books, photos, videos, short messages and call records. If it's a cloud of mobile phones, so much the better. Generally, it won't be leaked, and the rest is hard to say.