@Hari after reviewing this plugin, I’m going to recommend that you don’t use it. This is for a variety of reasons, but the foremost is that’s it’s an untrusted APK meaning you have to install it manually and can’t get it from the play store which also means it’s not sanctioned as being safe to use.
Installing an app in this manner can easily expose the device to malware and it’s not something I’d either condone or actively support.
Personally, I’d never rely on a mobile phone to deliver SMS messages, but would use something like the API of Click Send. They have a pay per use service which is also cloud based and will be both reliable and safe to use.
https://developers.clicksend.com/docs/rest/v3/