javascript objects change menu options

Create 3 different cellPhones objects: cell1, cell2 and cell3

Every object has this attributes: brand, model, colour, price, isAvailable

Create a user menu to give the possibility of changing the prices or availability of each cellPhone.
Check those changes through the console showing the object.

let cell1 = {
  price: "",
  colour: "",
  brand: "",
  model: ""
};
let cell2 = {
  price: "",
  colour: "",
  brand: "",
  model: ""
};
let cell3 = {
  price: "",
  colour: "",
  brand: "",
  model: ""
};

let cellString = 'price: ' + cell.price + ' colour: ' + cell.price + ' brand: ' + cell.brand + 'model: ' + cell.model;

for (let i = 1; i < 5; i++) {
  let option = parseInt(prompt('how would you like your cellphone 1-Change price 2-Change colour 3-Change brand 4-Change model'));
  switch (option) {
    case 1:
      letnewprice = parseInt(prompt('Type in the new price '));
      cell.price = newprice;
      alert('price is updated');
      break;
    case 2:
      letnewcolour = prompt('Type in the new colour')
      cell.colour = new colour;
      alert('colour is updated')
      break;
    case 3:
      letnewbrand = prompt('Type in the new brand');
      cell.brand = newbrand;
      alert('brand is updated');
      break;
    case 4:
      letnewmodel = prompt('Type in the new model');
      cell.model = newmodel;
      alert('model is updated');
      break;
    default:
      alert('this is not an option');
      break;
  }
  console.log(cell1);
}