Xiaomi mobile phone is equipped with two cards, and whether the call messages of the two cards will all be in the same cloud.

Yes, the cloud service is associated with the mobile phone through Xiaomi account, not with the mobile phone number. Backup means that the content of the mobile phone is not divided into mobile phone cards, so the call information of the two cards will be in the same cloud.

The blacklist of mobile phones is also aimed at mobile phones rather than mobile phone cards, so the blacklist numbers of both cards cannot be dialed in.