flutter_phone_direct_caller
A simple plugin to call number directly from app, without going to phone dialer. Permission request is handled by plugin.
Usage
Add dependency to pubspec.yaml file
flutter_phone_direct_caller: ^2.2.1
Android
No need any additional configuration.
iOS
Add this to your info.plist under dict
<key>LSApplicationQueriesSchemes</key>
<array>
  <string>tel</string>
</array>
Example
import 'package:flutter/material.dart';
import 'package:flutter_phone_direct_caller/flutter_phone_direct_caller.dart';
void main() {
  runApp(Scaffold(
    body: Center(
      child: RaisedButton(
        onPressed: _callNumber,
        child: Text('Call Number'),
      ),
    ),
  ));
}
_callNumber() async{
  const number = '08592119XXXX'; //set the number here
  bool res = await FlutterPhoneDirectCaller.callNumber(number);
}