How to block, mark as spam, or unblock phone numbers on Xiaomi devices

Xiaomi Mi Note 2 Global Edition Xiaomi Mi Note 2 Global Edition
Xiaomi Mi MIX Exclusive Edition Xiaomi Mi MIX Exclusive Edition
Xiaomi Redmi 4 Standard Edition Xiaomi Redmi 4 Standard Edition
Xiaomi Redmi 4 High Version Xiaomi Redmi 4 High Version
Xiaomi Redmi Note 4 SD625 Xiaomi Redmi Note 4 SD625
Xiaomi Redmi 4X Xiaomi Redmi 4X
Xiaomi Redmi Note 4X High Version Xiaomi Redmi Note 4X High Version
Xiaomi Redmi 4 SD435 Xiaomi Redmi 4 SD435
Xiaomi Redmi Note 5A Standard Edition Xiaomi Redmi Note 5A Standard Edition
Xiaomi Mi Note 2 Special Edition Xiaomi Mi Note 2 Special Edition
Xiaomi Redmi 5 Plus Xiaomi Redmi 5 Plus
Xiaomi Mi 5X Xiaomi Mi 5X
Xiaomi Redmi Note 5A High Edition Xiaomi Redmi Note 5A High Edition
Xiaomi Mi A1 Xiaomi Mi A1
Xiaomi Mi MIX 2 Special Edition Xiaomi Mi MIX 2 Special Edition
Xiaomi Redmi Y1 Xiaomi Redmi Y1
Xiaomi Redmi Note 5 Pro SD636 India Xiaomi Redmi Note 5 Pro SD636 India
Xiaomi Redmi Note 5 SD625 India Xiaomi Redmi Note 5 SD625 India
Xiaomi Redmi Note 5 SD636 China Xiaomi Redmi Note 5 SD636 China
Xiaomi Mi 6X Xiaomi Mi 6X