For cars, changes like these are phased in multiple steps. For each car model, companies mass producing cars have to obtain a permit for the model. Then, they a

For cars, changes like these are phased in multiple steps. For each car model, companies mass producing cars have to obtain a permit for the model. Then, they are allowed to sell those cars. At which point the individual owners get their cars registered at the government office. The phasing in happens by first requiring it for permits for new models. The manufacturers can still build and sell older models. A few years later, the rule also applies to all first registration of new cars, to prevent car manufacturers to avoid the new rules by keeping to produce an older model. IDK if something similar exists for electric household devices. For the famous light bulb ban, they introduced it via import and manufacturing restrictions, so you could still sell the light bulbs, and still can today, but you can't either build new light bulbs or (legally) get light bulbs from outside of the EU into the EU. You could do the same for phones, just ban the imports at a specified date in the future so that the hardware can be readjusted in time. Anyways, this only affects one manufacturer (Apple) and they don't have as much of a market share here as in the US.