Apple has determined that “a very small percentage” of iPhone 14 Plus models have rear camera issues and has done so. launched a service program to repair them for free. If your phone does not show a preview when using the rear camera, then you may be eligible to have it fixed at no cost; You can also contact Apple for a refund if you've already paid for the repair. The affected devices were manufactured between April 10, 2023 and April 28, 2024, about half a year after the model began shipping in 2022.
You can check the serial number of your device in the official page of the repair program to find out if your device is included. To fix this, you can take your phone to an Apple Authorized Service Provider or Apple retail store after making an appointment. You can also contact Apple Support if you want to mail your device to a repair center. The program covers repairs on all eligible phones for three years after the original purchase date, so you may want to keep that in mind in case your unit begins to exhibit the problem in the future. Apple says it may “restrict or limit repair” to the region of original purchase of the unit, so you'll have to check with the company if you bought your iPhone while traveling outside your country.