Why do text messages received on Samsung phones begin with vivo?

Received a text message starting with #vivo#. This is an instruction text message related to finding a mobile phone. Since you have performed relevant operations on the mobile phone search website and your SIM card is installed in other brands of mobile phones, you will receive it. Such text messages. Vivo mobile phones will automatically hide this information, but other brands of mobile phones do not have this function, so the text message content will be displayed.

Command notes:

Location tracking: #vivo#location#

Sound alarm sound: #vivo#ring#

Lock screen ：#vivo#lock#

Backup data: #vivo#backup#

Clear data: #vivo#clean#