Overview
- A prominent creator reported that an iPhone Duo unit grew extremely hot during sustained 4K 60fps recording and later developed flicker on the external screen after he reverse-bent the unfolded device.
- The reviewer said the phone became too hot to hold after roughly three minutes of high-load recording and called its thermal behavior worse than a tested iPhone 18 Pro model that used a larger vapor chamber spreader.
- Apple customer service told users the online test is one-sided, noted the device is not yet on pre-sale in mainland China, recommended trying units in stores after launch, and offered technical checks for suspected hardware faults.
- Apple said devices may need a three- to five-day adaptation period for normal heat behavior and stated reverse-bending is treated as user-caused damage and not covered by warranty.
- Observers say broader independent testing of retail units is the next step to confirm whether the issue is a design thermal limit, a fixable software throttle, or isolated to individual units and to determine any service or software response.