Use APKPure App
Get REST SMS Gateway old version APK for Android
This app allows task automation with REST API, i.e. send, sync and browse SMS
This apps allows to change your phone into SMS Gateway. Thanks to REST commands sent from your computer you can send and view existing messages. Private SMS Gateway allows you to do independent SMS Marketing (bulk SMS sending), backup your messages or anything you would like to do. This app is the easiest way to do your task automation, SMS sync & send. Just install, press button Start and enjoy!
A detailed manual is available inside :)