private void ValidateCellPhoneNumbers()
        {
            if (string.IsNullOrEmpty(Phone))
            {
                ErrorPhone = string.Empty;
            }
            else
            {
                ErrorPhone = ValidatorHelper.IsValidPhone(Phone) ? string.Empty : AppResources.InvalidPhone;
            }

            if (string.IsNullOrEmpty(CellPhone))
            {
                ErrorCellPhone = AppResources.CellPhoneRequired;
                return;
            }

            ErrorCellPhone = ValidatorHelper.IsValidCellPhone(CellPhone) ? string.Empty : AppResources.InvalidPhone;
        }