Use APKPure App
Get Android Bulk SMS old version APK for Android
This is application that uses your phone to send the bulk sms as per your need.
This app is best for group bulk sms to you contact list from your phone. It helps to save your time to send individual sms with customized text template. Free sms can be send using the app. It sync your sim card to send sms which you can use to send bulk sms to save cost per sms buying the sms pack.