Lithium-ion batteries degrade even when not in use. A battery that has sat at 0% charge for a decade may be "chemically dead," meaning it won't hold a charge or could even expand and damage the internal components the moment you plug it in.

Many carriers globally are shutting down their older 3G networks and refarming 4G bands. While the iPhone 6 supports 4G LTE, it lacks the modern bands and "Voice over LTE" (VoLTE) refinements required by some carriers today, which could lead to poor call quality or no signal at all in certain regions. When DOES it make sense to buy one?

In the fast-paced world of technology, a decade is an eternity. Released in 2014, the iPhone 6 was a landmark device that introduced the slim, rounded design language Apple used for years. However, if you are currently searching for a "brand new" iPhone 6, there are some serious technical and practical realities you need to consider.

While the 8MP camera was great for its time, it lacks 4K video, Night Mode, and the image processing power we now take for granted. 4. Connectivity Issues (The 3G/4G Sunset)

This is the biggest hurdle. Most essential apps—including WhatsApp, YouTube, banking apps, and Instagram—now require iOS 14, 15, or higher. You will find that the App Store will simply refuse to download the tools you need to function in modern life.

Here is everything you need to know about trying to buy a factory-sealed iPhone 6 today. 1. The "Brand New" Paradox

Most "new" iPhone 6 units on sites like eBay or third-party marketplaces are actually "remanufactured." This means they use an old motherboard inside a cheap, third-party shell with a non-original screen. They look new, but they aren't factory-original. 2. The Software Wall

Even basic web browsing on Safari will feel incredibly slow, often crashing because the phone runs out of memory.