$ scope upgrade problem with cordova and angularJS

Hello. I am developing an app using cordova, ionic and angularJS. And I have a problem updating an input.

I have the following function that runs on a ng-click:

$scope.buscarContato = function(){
$scope.phone = [];
$scope.phoneId = 0;
$scope.contact = [];
navigator.contacts.pickContact(function (contact){
  $scope.$apply(function(){
    $scope.contact = contact;
  });
  $scope.selecionarPhone(contact.phoneNumbers); 
},function (err){
   console.log('Error: ' + err);
});
};


$scope.selecionarPhone = function(phoneNumbers){
var phones = [];
var phoneId = [];
if(!phoneNumbers) return;
 for(var i = 0; i < phoneNumbers.length; i++){
  phones.push({"text": phoneNumbers[i].value});
  phoneId.push( phoneNumbers[i].id );
}

var options = {
  titleText: "Escolha o número a ser pesquisado",
  buttons: phones,
  cancelText: 'Cancelar',
  cancelOnStateChange: true,
  buttonClicked: function (index) {
    $scope.phone = phones[index].text;
    $scope.phoneId = phoneId[index];
    $scope.contatoExiste = true;
    return true;
  }
};

$ionicActionSheet.show(options);

};

At the end of the run, I change the value of an input on the screen,

$scope.phone = removerMascara(phones[index].text);

Input:

<input type="tel" placeholder="11999999999" name="phone" data-ng-model="phone" maxlength="15" required>

The search and change of the input happens normally, but if I change the input manually, I can no longer change it with the schedule data, and even the first line of the function, where zero the data, works.

How should I handle this scope correctly?

Edit: The problem was solved by placing the phone scope under a parent:     $ scope.data.phone

Can anyone explain why there was such a difference?