code: function Phone(obj){
      this._id = obj && obj.id;
      this._tag = obj && obj.tag;
      this._phone = obj && obj.phone;
      this._normalizedPhone = obj && obj.normalizedPhone;
  }
docs: Contact Phone information
  @typedef {Object} Contact.Phone
  @property {string} tag - a context tag
  @property {string} phone - The phone number to add
  @property {string} normalizedPhone - The contact's normalized phone number