What do you mean by imitating Hk?

imitation of Hk means preventing fraud.

the "HK" in the short message is the first letter of the card replacement service, and then write the card number on the back of a blank mobile phone sim card after the "HK". As long as the victim sends the information to "186" as required, the victim's mobile phone card will be automatically replaced in the hands of the liar. Hk refers to fraudulent short messages, that is, there are many short messages asking you to reply. If you don't understand, you can ask your family or call the police. Don't reply randomly. The message sent by the other party may be machine big data. The more messages you receive, the less you don't reply. When you encounter a similar situation, you don't know what to do at first, but as a result, there are more and more messages. Later, if you don't reply, it will be gone.