Which SMS platform is easy to use in China?

After years of survival of the fittest, it is very simple to use now, and only two steps are needed:

Enter all the mobile phone numbers one by one into a wps, that is, an excel form. Prepare for step two.

2. After all mobile phone numbers are imported into the number box, write the short message and send it for 3 seconds. Then someone else's mobile phone will ring a beep message. Take it out and read your message.