How to read sms when flutter app is closed

We are building an app in flutter where we have a requirement to read user sms. We are able to successfully read a message using https://pub.dev/packages/telephony plugin when app is open. This plugin also provided background message handle which we implemented but still we are not able to read message when app is closed. Is there other way to achieve it.

telephony.listenIncomingSms(
        onNewMessage: (SmsMessage message) {
            // Handle message
        },
        onBackgroundMessage: backgroundMessageHandler
    );