Is it possible to replace the battery in the chip with a smartphone?

Question

Electronics

There is a circuit that includes the main element (let's say a light bulb), a button and a battery. Accordingly, the button closes the circuit. If you solder an input into this circuit that will be connected to the output of the phone, will the circuit work if you apply voltage to this output?
How feasible is this scheme? And which output to use (the most common options: mini jack or mini usb)?
Also, if this is impossible to do, then how cumbersome will it be to solder into this circuit so that the battery remains, but the circuit would be closed from the phone? What can be used for this?

Answer 1

As far as I know, the smartphone does not give voltage to the outside through any output.
Cheaper to buy a flashlight
This scheme has just been implemented.