If your car can only be unlocked by your phone you made a mistake when buying it. Just like if it features proprietary chargers. These things just don't last.
You can still buy new cables that fit the first iPhone today but you can’t buy a new iPhone that fits the 30pin charging dock in old cars.
The main difference though is that you’d expect a device like an iPhone or iPad to last a maximum of about 3 to 5 years while you’d expect a car to last 10 to 25 years. Accordingly it would be wise to use future proof parts, not proprietary parts that go out of style every few years.
