What should I do if I always receive the subscription information update from Party B via SMS?

If it is a text message sent by a regular app, you can reply to unsubscribe according to the instructions.

If it is judged as spam, you can reply "0000" to block the SMS of this mobile phone number from the system level.

If the above two methods are ineffective, you can report to the operator.

Many spam messages are sent from "pseudo base station", which is a radio transmitter disguised as a base station of a communication operator. From the appearance, the pseudo base station consists of a chassis, a transmitter and a notebook computer. And its working principle is basically: first, invade the operator's network; Second, the authentication method in the process of false information transmission; Then interfere with the communication signal of the shielding operator; Finally, cheat the verification link and send harassing fraud messages to mobile phone users, which can usually be completed in a short time.