If you want to keep your iPhone looking pristine, whether for aesthetic or resell value reasons, a glass screen protector offers probably the best ROI of any mobile accessory. These highly rated protectors from amFilm (iPhone Xs Max | iPhone 6/7/8 Plus | iPhone 6/7/8) are priced at $8 for a 2-pack or 3-pack, but you can use a promo code (make sure you pick the correct one) to bring them down to just $3.