Apple now sells an iPhone dongle with a headphone jack and charging port - The Verge
The Belkin-made adapter costs $35 and is available at Apple retail stores.
[Apple MFi Certified] 2 Pack Lightning to 3.5mm Headphones Jack Adapter for iPhone, 2 in 1 Charger +Aux Audio Splitter Dongle Adapter for iPhone 13/12/SE/11/Xs/XR/X/8 7 Support All iOS &Volume Control
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esbeecables 2 Pack Lightning to 3.5mm Headphones Adapter, Apple MFi Certified, Supports All iOS Devices : Electronics
[Apple MFi Certified] 2 Pack Lightning to 3.5mm Headphones Jack Adapter for iPhone, 2 in 1 Charger +Aux Audio Splitter Dongle Adapter for iPhone 13/12/SE/11/Xs/XR/X/8 7 Support All iOS &Volume Control
Apple no longer ships free headphone dongles with new iPhones - The Verge
Apple's 2018 iPhones are rumored to not include headphone dongle in the box - The Verge