This is the most common complaint. Many used units have significantly degraded batteries, sometimes lasting only half a day or requiring immediate replacement.
Some users reported sudden hardware failures, such as displays dying after a few months or volume buttons becoming unresponsive. Critical Limitations for 2026 buying iphone 6 on ebay
Reviewers often note it is a good "starter" or "backup" phone for basic calling, texting, and lightweight browsing. This is the most common complaint
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The iPhone 6 is stuck on iOS 12, meaning it no longer receives security updates or support for the vast majority of modern apps.