Drupal 8: Get User Profile Field Allowed values list

Say, you have a user profile field: field_phone_brand

And you have options:

iPhone|iPhone

Samsung|Samsung

MI|MI

Oppo|Oppo

Vivo|Vivo

And you want to get the allowed values list in a custom module/theme,

$entityManager = \Drupal::service('entity_field.manager');

$fields = $entityManager->getFieldStorageDefinitions('user', 'profile');

$options options_allowed_values($fields[$fieldName]);

If you print:

echo '<pre>';

print_r($options);

echo '</pre>';

You will get:

Array
(
    [iPhone] => iPhone
    [Samsung] => Samsung
    [MI] => MI
    [Oppo] => Oppo

    [Vivo] => Vivo

)