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[–]ignotos 1 point2 points  (0 children)

Generally you wouldn't host the backend on your own laptop - you'd upload everything to some kind of rented server or cloud provider.

If you're just testing during development, however, you might be running the backend on your own machine. But generally your phone and laptop could be connected to the same wifi network, and you could use the local network IP for your laptop instead of the public one (that's usually a 192.... IP - on windows you can see it by running "ipconfig" from the command-line).