Get some informations of the device where you Flutter app is installed.

device_info.dart

import 'dart:io';

import 'package:device_info/device_info.dart'; //https://pub.dev/packages/device_info

class DeviceInfo {
  Future<String> get deviceModel async {
    final DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
    if (Platform.isAndroid) {
      final AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
      final String manufacturer = androidInfo.manufacturer;
      final String model = androidInfo.model;
      return '$manufacturer $model'; // Xiaomi Redmi Note 7
    } else if (Platform.isIOS) {
      final IosDeviceInfo iosInfo = await deviceInfo.iosInfo;
      final String device = iosInfo.utsname.machine; //List with all iPhone Models X iPhone IDs: https://everymac.com/systems/apple/iphone/index-iphone-specs.html
      final String model = iosInfo.model;
      return '$device $model'; // iPhone11,6 iPhone
    } else {
      return 'Unknown platform and Device model';
    }
  }

  Future<String> get osVersion async {
    final DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
    if (Platform.isAndroid) {
      final AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
      final String release = androidInfo.version.release;
      final int sdkInt = androidInfo.version.sdkInt;
      return 'Android $release (SDK $sdkInt)'; // Android 10 (SDK 29)
    } else if (Platform.isIOS) {
      final IosDeviceInfo iosInfo = await deviceInfo.iosInfo;
      final String systemName = iosInfo.systemName;
      final String version = iosInfo.systemVersion;
      return '$systemName $version'; // iOS 14.2
    } else {
      return 'Unknown platform and OS version';
    }
  }

    Future<String> get aboutDevice async {
    final DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
    if (Platform.isAndroid) {
      final AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
      final String release = androidInfo.version.release;
      final int sdkInt = androidInfo.version.sdkInt;
      final String manufacturer = androidInfo.manufacturer;
      final String model = androidInfo.model;
      final String finalModel = '$manufacturer $model'.removeOnlySymbols;
      return 'Android $release (SDK $sdkInt), $finalModel'; // Android 10 (SDK 29), Xiaomi Redmi Note 7
    } else if (Platform.isIOS) {
      final IosDeviceInfo iosInfo = await deviceInfo.iosInfo;
      final String systemName = iosInfo.systemName;
      final String version = iosInfo.systemVersion;
      final String device = iosInfo.utsname.machine;
      final String model = iosInfo.model;
      return '$systemName $version, $device $model'; // iOS 14.2, iPhone11,6 iPhone
    } else {
      return 'Unknown platform and Device';
    }
  }
}