Changing your mobile phone battery in the 2000s: pop off the back like changing batteries in the TV remote.

Changing your mobile phone battery now: remove back with a specialised spudger and a suction cup. Undo 14 screws. Remove the screen with the spudger. Remove a layer of circuitboard and disconnect a ribbon cable. Fight powerful adhesive to remove the battery. Then do all that in reverse.

This should be illegal and I'm not joking.