6 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
iPhone 15 Plus USB-C charging port stopped working after a month
An EU-market owner reports the USB-C charging port stopped working after a month of use. A hardware failure on a key consumable part, with the seller's service described as inadequate.
What to check. Test the USB-C port early in the warranty period; a port failure after a month is a hardware defect you should have repaired under warranty.
iPhone 15 Plus overheats while charging, won't charge past 80%, and shuts down at 21%
A Turkish owner reports the phone overheating during charging, charging stopping at 80%, and the device powering itself off at 21% charge; the authorized KVK service returned the phone saying 'there is no problem'. This is a TR-market owner complaint.
What to check. If you buy an iPhone 15 Plus in Turkey, test charging behavior and battery cut-off within the warranty window; the seller's service may deny a fix, so document the fault.
iPhone 15 Plus randomly powers off and fails to turn back on
A Turkish-language article quoting an owner whose iPhone 15 Plus began shutting itself off, then refused to power on even at 70% charge, only turning on when plugged in. This is a TR-market report of a power/battery failure.
What to check. If the phone shuts off at high charge or won't power on, suspect the battery or power management; back up data early because the device may become unusable.
iPhone 15 screens developed green/pink/white lines after the iOS 18 update
A news report of an Indian consumer-protection investigation into iPhone 15 screens developing green/pink/white lines after the iOS 18 update, with Apple charging ~27,900 INR for display replacement. This documents a display failure mode on the iPhone 15; note the source is India/China-focused, not TR/EU.
What to check. Display lines on iPhone 15 are documented after iOS 18; if lines appear, record them and push for warranty coverage before paying for a screen replacement.
Apple acknowledged iPhone 15 models overheating due to a software bug and app overload
A news report of Apple's official statement that iPhone 15 models ran hot at launch due to an iOS 17 bug and app overload, with a software fix promised. This is a manufacturer-acknowledged issue, not a one-off owner report.
What to check. Overheating on early iPhone 15 units was largely software-related and addressed by iOS updates; keep the phone updated before assuming a hardware fault.
iPhone 15 Plus battery health dropped to 88% after one year
A Ukrainian (EU-adjacent) owner reports the battery's maximum capacity at 88% after only one year, which is faster than Apple's stated design target of retaining 80% at 1000 cycles. This is an EU-market owner report.
What to check. A battery reading 88% after a year is below the typical expectation; if you buy used, check the cycle count and maximum capacity in Settings before purchase.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Smartphones catalog, version 0.1.1, under the CC-BY-SA-4.0 license.