However, you might not know that there's a real danger when using an iPhone for too long. In particular, if an iPhone can no longer run the latest version of Apple's iOS operating system, it will miss out on many critical security updates. Vulnerabilities that aren't fixed can put you at risk. The iPhone 6 is sure to remain in the memory of many Apple users, as it was the company's first smartphone with a considerably larger screen than its predecessors.
The phone was discontinued a few years ago, but it's still receiving security patches and technical support from Apple, perhaps not for much longer. Apple has now added the iPhone 6 to its “old products” list. No, the iPhone 6 is not being phased out. It will continue to work as long as you want.
You simply won't be able to update it to the latest versions of iOS, and you won't be able to take advantage of the new features offered by those newer versions. Statista (a provider of market and consumer data) publishes a graph showing how long Apple is compatible with older iPhones. While it's just an estimate, Apple currently offers iPhone models for about seven years, so this should give you an idea of how long the replacement will last (assuming the hardware holds up). You might also be interested to know how long Apple has been compatible with Macs and how long Apple has supported iPads.
The only real option that allows you to use the latest version of iOS is to buy a new or used iPhone that continues to receive support. Strangely enough, the larger iPhone 6 Plus was already considered a classic product before the iPhone 6.Software support lasts longer than eight to ten years, while hardware support can be available on phones for five to seven years. This is because Apple continued to sell the 4.7-inch iPhone 6 for a longer time in some regions after permanently discontinuing the iPhone 6 Plus. Apple will support iPhones (and all the devices it makes) for seven years starting from the last time it sold that particular model.
This suggests that while the iPhone 6s may receive software support for a while, it may not be possible to repair it if it breaks.