The 400 Series can currently be used with rooted Android devices.
The 400 Series cameras can work with any Intel or ARM processor. Apple's own mobile device chips are based on ARM 64, so in theory the 400 Series might be able to interface with them. Intel would certainly like RealSense to be everywhere possible and have designed the open-source RealSense SDK 2.0's API to be easy to integrate into a wide range of different platforms.
Apple is not against RealSense either, since it is fine with allowing an iOS version of the calibrator chart for the 400 Series to be on its store.
Technologically it may be possible. It probably comes down to whether Apple are willing to support connecting RealSense officially on their mobile devices (things are much easier with using the cameras on Mac computers, of course). I don't work for Intel though, so I have no official knowledge on the subject.
thanks for your answer, the Android stuff is interesting. Currently I am looking into IOS and concerning the documentation I added in the original post, Intel needs to sign in as external accessoires manufacturer with Apple and support the right protocols to allow the data connection via cable.
You are perfectly right that Apple and Intel are most likely willing to work together. That’s why I was hoping they are already working on providing the support for the toolkit and some Intel official could give some more feedback on this. Or maybe they didn’t yet think about it and would consider adding it to support it in the future as the RealSense SDK is developing further.
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Thank you for your interest in the Intel RealSense D400 Series.
Currently, there is no plan to add iOS support. However, the Intel RealSense SDK 2.0 is supported on Windows, Linux and Mac OS.