How to send messages to new and old customers when a new store opens?

To open a new store in a new location, it is necessary to notify previous customers to visit by SMS. Just do these two steps:

Prepare the other party's mobile phone number, that is, the previous customer's mobile phone number, into the spreadsheet excel.

Write down the content of the short message to be sent (including address+phone number+preferential activities) on the above interface, and then import the number. It took 2 seconds.