Error is thrown when array is passed to eloquent object - php

Question

I'm having some trouble to insert data on a One to Many relationship using Eloquent. When I pass an array to the object as the documentation states an error is thrown and when I echo $ex->getMessage() only the index of the array I'm trying to pass("number") is printed. Does anybody have any idea why this happens?
public static function insert(Request $request, Response $response) {
try {
$data = $request->getParsedBody();
$user = new \User;
$user->name = $data['name'];
$user->flag = $data['flag'];
$user->login = $data['login'];
$user->password = md5(SALT . $data['password']);
//$user->save();
foreach ($data['phoneNumbers'] as $key => $number) {
$phonenumber[$key] = new \Phonenumber(array("number" => $number));
}
$user->phonenumbers()->saveMany($phonenumber);
$meta = Helper::retornaMetaArray(Enum::SUCS_STS, Enum::CREATED, 201);
return $response->withCustomJson(null, $meta);
} catch (Exception $ex) {
echo $ex->getMessage();
}
}
This is what I'm sending on the request body:
{
"name": "Jon Snow",
"login": "jon",
"password": "ghost",
"flag": "1",
"phoneNumbers": ["(82) 99178-1066", "(82) 99303-9037"]
}