대량문자발송기 is an Android app that allows users to send the same SMS or MMS message to multiple recipients selected from their address book.

With this app, users can utilize their existing contact groups without the need for separate group management. They can also choose to include or exclude specific senders within a group.

The app is compatible with all three major mobile carriers in South Korea (SK, KT, LGU).

This app is particularly useful for individuals involved in insurance and sales-related work, as well as for those organizing club or group meetings.

Please note that when using LG U+ as the mobile carrier, additional messages may be sent depending on the number of MMS transmission bytes.