plugin not working, reported not installed under iOS

[whisere]

Expected behaviour

It works under Android, but under iOS it reports plugin not installed. although on xcode build phrase - compiled libraries the Sim.m is included, plugin folder also exists.

Actual behaviour

WARN: Ionic Native: tried calling Sim.requestReadPermission, but the Sim plugin is not installed.
Install the Sim plugin: 'ionic cordova plugin add cordova-plugin-sim'
Your phoneNumber is
ERROR: ERROR Error: Uncaught (in promise): plugin_not_installed

I'm seeing this behaviour on

• iOS device
  iPhone, iPad

I am using

• cordova
• ionic

Hardware models

iPhone xs

iOS versions

12.2, 12.1

I've checked these

• I'm using the latest cordova library, Ionic, Xcode, etc.

So how can we reproduce this?

Provide the steps to reproduce the issue.
ionic cordova plugin add cordova-plugin-sim
npm install --save @ionic-native/sim@4
run successfully
build and run without problem under xcode.

Any idea will be much appreciated.