How to identify Unknown number in Mi Phones or avoid Fraud calls
With the increasing amount of spam SMS messages every day, sometimes it becomes difficult to identify the sender, to address the problem of identifying senders Xiaomi’s MIUI offers Yellow Pages. Yellow pages (Caller ID) is an inbuilt feature in MIUI 8 and 9 which identifies SMS messages and calls from businesses.
Whenever an unknown number is used for placing/receiving calls or sending/receiving text messages, this number will be uploaded to Xiaomi servers for identification of the number’s “tag information” (the service guarantees that user’s personal information will not be acquired by a third party, and therefore user’s identity will not be at risk of exposure to a third party as a result of the upload);
Step 1: Long Press Menu Button at Phone Call Page

Step 2: You will See Identify Unknown Numbers option, click it.

Step 3: Enable Caller ID

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