The iPhone 16 Pro models, thanks to the use of the A18 Bionic, will feature faster LPDDR5X making the phone more energy-efficient. Currently, the iPhone 14 Pro models use LPDDR5 RAM and the non-Pro units feature LPDDR4X RAM. Since there is talk that the iPhone 15 Pro handsets will use 8GB of RAM instead of the current 6GB, the iPhone 16 Pro line could come with 8GB of LPDDR5X memory. That should also improve the multitasking capabilities of those models.

The iPhone 15 Ultra is rumored to sport solid-state volume buttons that would feel like you pressed on the current physical buttons
The iPhone 15 and iPhone 15 Plus (if indeed Apple continues with the "Plus" model) are expected to feature a 48MP Wide rear camera, and the Dynamic Island is reportedly coming to the less-expensive 2023 iPhone models. Love it or hate it, kudos to Apple for actually making something interesting and useful out of the notch.The iPhone 15 Pro and iPhone 15 Ultra could sport solid-state haptic volume buttons that would feel just like you just pressed a regular physical button thanks to three haptic engines. This rumor was driven by a comment made by Apple supplier Cirrus Logic that said the company would "bring a new HPMS (high-performance mixed-signal chip) component to market in smartphones next year." Among the HPMS designed by Cirrus Logic are haptic drivers for the iPhone's Taptic Engine.
Obviously, when we talk about rumors about the iPhone 16, it is pretty much conjecture at this point. But before you know it, September will roll around and the iPhone 16 series will be "on deck."
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