Use APKPure App
Get SMS Gateway Plus old version APK for Android
ऐप आपके फोन को एसएमएस गेटवे में बदलने की इजाजत देता है
The SMS Gateway, an app that turns your mobile device into SMS Gateway that Sends SMS
Messages from your applications.
It is somehow cheaper to sign up to a text messaging bundle/plan and save heaps of money on paying SMS gateway providers for every SMS you send.