I know I promised to stop going on about iPhones several pages ago, but I just can't hold back when I see messages like this. If you care at all about audio, please, please, please don't buy an iPhone! I promise you, Apple doesn't care about you or your audio. I've owned a lot of Apple kit in the past (see for example:
https://www.head-fi.org/f/threads/apple-ditching-3-5mm-jack.795656/page-2#post-12708687), but right now, for audio, iOS/iPhone is inferior in so many ways. 1) Apple now forces you to use either Bluetooth or a stupid proprietary connector/dongle whose future is, at best, uncertain. Using Bluetooth with an SE846 is like putting a lawnmower engine in your Porsche. And Lightning has a lot of manufacturing and end-user restrictions, such as the type/position/circuitry of the Lightning plug/dongle, dynamic range and resolution/format limitations. 2) Apple doesn't natively support formats like FLAC or DSD and the Lightning dongle limits hi-res output formats. You still can't even purchase basic ALAC lossless music via the iTunes store, so the only way of getting lossless files into your iTunes app on the phone is to transfer them via a separately-maintained iTunes library on a PC/Mac. 3) You can't access the filesystem on an iOS device without a jailbreak (and jailbreaking is virtually dead anyway these days, because of Apple's insistence on you paying to be in their walled garden.) With an Android device you can easily grab a new album or set of files and wirelessly dump them from Dropbox or your own NFS onto your internal or external flash memory. 4) You've got a ton of choice with Android phones these days, including many with dedicated, good-quality DACs. With iOS, you've got just one choice - an iPhone
5) This is the most important point... Look carefully at the anti-consumer pattern of behavior from Apple in recent years - it's very likely there's more to come as Apple turns the thumbscrews to offset revenue loss from their declining innovation and software quality. Why would you want to trap yourself in an ecosystem like that?