Intrinsic value is a value that derives from the use of properties of the thing. It's not a derived value that requires the imposition of an additional layer of context to make the property valuable.
The iPhone, or any other phone, has the intrinsic value of being usable as a computing device, entertainment device, communications device, camera, thrown weapon, etc. If you want to be pedantic about it, the components that make up the iPhone have the intrinsic values of being usable for one or more of the above functions, and the materials that go into those components have the intrinsic value of being usable in industrial/commercial products or processes.
A bitcoin literally has no use inherent use on its own. It's simply a number. The exchange of these numbers has no intrinsic value, it would be like me and Adam exchanging a 2 and a 3 (not dollars or anything other units, literally just the numbers). Any value from the exchange is an additional layer of context imposed by me and Adam on the transaction--it's not intrinsic to the bitcoin itself.