Apple’s latest iPhones, unveiled this week, come with new features, better cameras and hefty price tags – including a folding model with a starting price of US$1,999. If you’re planning to splurge on a new iPhone 18, you will want to take care of it to make it last as long as possible. Or save money by holding on to your current device, whether it is Apple or Android, to get the most life out of it.