Apple iPhone 8 Plus gets hot or shows a temperature warning

5.5-inch widescreen LCD with IPS technology, at 1920-by-1080 at 401 ppi. That matters more than it sounds — a procedure written for a different size in the same line puts controls in different places, and gestures that depend on reach behave differently.

Lightning. A USB-C cable will not fit at all, which is the usual explanation when a charger that works on a newer iPhone in the same household does nothing here. Lightning cables also fail internally at the strain point, so a cable swap is the first test for slow or intermittent charging.

Touch ID — a fingerprint reader. General iPhone advice about lighting, angles and face coverings does not apply. What affects this model is moisture and the skin itself changing, and enrolling the same finger a second time helps more than repeated attempts against one reference.

The A11 Bionic. This determines how long the model keeps getting iOS updates, and it is the reason an app can drop support for this iPhone while running fine on a newer one — a support-window matter rather than a fault to troubleshoot.

64GB/128GB/256GB. The 64GB tier is the single most common cause of storage trouble on this model, and it is why an update can refuse with what looks like enough space free — installation needs room to unpack and stage as well as to store.

No. It is rated IP67, a lower rating than the IP68 models later in this line — splashes and brief incidental exposure rather than submersion. The rating also degrades with age and drops, and liquid damage is not covered.

No. This model uses a physical nano-SIM only, so any instruction about transferring or reissuing an eSIM profile does not apply to it, and changing carriers means physically swapping the SIM.

Bluetooth 5.0. Version affects range, reconnection behaviour and which accessory features are available. A newer accessory paired here operates at this version's capabilities rather than failing, which is regularly mistaken for a pairing fault when the accessory simply cannot do everything it does on a newer phone.

625 nits maximum brightness (typical). Brightness is among the largest single consumers of battery, so outdoor use at full brightness costs real runtime — and poor outdoor readability on this model is usually this figure rather than a display fault.

2x optical zoom in; digital zoom up to 10x. If a close-up will not focus at the long end, that is normally the telephoto's minimum focus distance rather than a fault — taking the same shot at 1x confirms it in seconds.

Apple rates it at up to 50% charge in 30 minutes. That assumes an adequate adapter — a low-output adapter, a laptop USB port or an old car charger falls well short, and that is the usual reason a phone charges far more slowly than the specification suggests.

4K video recording at 24, 30 or 60 fps. Resolution and frame rate are the dominant factor in how fast video fills storage, and they push the phone hardest thermally — sustained high-frame-rate recording is the most common reason a camera stops mid-take.

Not meaningfully. This model uses an LCD panel, which backlights the whole screen regardless of what is displayed. Dark mode only saves real power on the OLED iPhones, where black pixels are switched off entirely.

During sustained heavy work — gaming, video recording, navigation with the screen on, a long video call — yes, and it should cool within minutes of stopping. Warm while charging is also normal. Hot at idle with nothing running is not, and that distinction is the whole diagnosis.

Fast charging generates real heat, and it matters far more where the phone is than how long it charges. A phone charging on a bed, a sofa or under a pillow, in a thick case, is doing permanent capacity damage. On a hard surface with the case off, warmth is expected.

That is the phone protecting itself, and it worked. A dashboard in sun reaches temperatures far beyond anything the phone generates, and it absorbs rather than produces the heat. Repeated exposure permanently reduces battery capacity even though the phone recovers each time.

Then something is using it. Check the battery usage breakdown with the screen off — a stuck background process holds the processor awake continuously and produces exactly this. If the breakdown attributes nothing and there is no environmental cause, that is a different and more serious finding.

Yes, particularly a thick or insulating one during fast charging or heavy use. The back of the phone is a heat path, and a case is deliberately in the way of it. Removing the case during charging or gaming is a real, measurable change.

Yes, and this is the reason to take it seriously. Heat is the main driver of capacity loss besides charge cycles, and it is not reversible — a phone that has cooked in a car repeatedly will not return to its original runtime even once it is cool.

Photo indexing, search rebuilding and app optimisation all run once after a major update, and they are genuinely heavy. Give it a few charge cycles before treating it as a fault — you are measuring the indexing, not the phone.

No. Rapid cooling causes condensation inside the phone, which is a far worse problem than the heat. Move it into shade, take the case off, stop what it is doing, and let it come down on its own.

Stop. That is the battery swelling and pushing the display out, and it is a stop condition regardless of how well the phone otherwise works. Do not charge it unattended, do not compress it, and do not attempt to press it back.

No. It is scoped to A1864/A1897/A1898. Current Apple iPhone family; camera controls, modem, connector and iOS features vary by exact hardware/region identifier.

Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.

A reset can erase accounts, networks, maps, schedules or preferences without distinguishing overheating, hot phone. The ordered checks preserve that evidence.

Power off for swelling, smoke, odor, extreme heat or repeated warnings at idle.