I'm looking for a word which encapsulates the above concept. An example: when someone knows how to use their phone, but doesn't understand how to take it apart, put it together, etc.
We may use the simplistic term :
•WORKING KNOWLEDGE — the adjective can be made WORKABLE if need be.
But I would love to use - BASICS - in all these situations.
There is a relevant term, but it refers to the object being used, not to the user. In your example, the person is using their phone as a black box. As Wikipedia says,
a black box is a device, system or object which can be viewed in terms of its inputs and outputs [...], without any knowledge of its internal workings.
I'm unable to dismantle and/or repair much of the technology I use - mechanical and electrical. In these instances I would describe myself as a consumer.
I would call it superficial understanding, which suggests that there is a lot that is not understood (the inner workings of the device).