network type not getting in iOS using Ionic native

Question

We are developing an ionic native mobile application. we need network type (wifi,2g,3g,4g).We are getting in android but unable to get in iOS.We tried those commands for network plugins

$ ionic cordova plugin add cordova-plugin-network-information
$ npm install --save @ionic-native/network

Code

this.platform.ready().then(() => {
    setTimeout(() => {
      var networkState = this.network.type;
      alert("networktype"+JSON.stringify(this.network));
      console.log("networktype"+JSON.stringify(this.network));
    }, 30000);

    });

Always we are getting null in iOS. guide to us what we miss iOS version :10.3.3 ionic info :