are they phone specific? they really shouldnt be since most companies don't include one in the box so you need to source your own. I know with samsung phones it needs to be the samsung version, at least my huawei one doesnt work with samsung.
Ideally I'd have 1 that would work with ANY (or at least most) phones
Ideally I'd have 1 that would work with ANY (or at least most) phones
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sorted byI believe some smartphones do use a less widespread part of the USB spec called Accessory mode in which case the USB port essentially just itself over to just being a connector to the phone's own analogue audio circuits. I have seen some places suggest the term passive to describe connector adaptors for such a mode.
And as USB is designed to connect anything a manufacturer is free to implement entirely custom communication that would require the system to understand that specific accessory (e.g. have a driver for it).
Your best bet for widespread compatibility is the first sort, but finding technical details on how cheap bits work can be tricky. Perhaps a good sign to look for is if it says it works with computers as well as accessory mode is not widespread there.
I use a third-party model with Samsung phones, so they're not brand specific.