Encouraging though it may be to visualize you can unlock your car door in an urgent situation by receiving a distant signal via your cell phone, it can't probably work not with the technology as it currently stands, at any rate.
Your remote car key operates by sending a weak, encrypted radio signal to a receiver surrounded by the auto, which in turn activates the door locks.Since the system works on radio waves, not sound, the only conceivable way a signal from your spare remote could be picked up by one cell phone and relayed to your car's onboard recipient by another would be if both phones were capable of sending and receiving at exactly the same frequency as the remote itself which they can't be, given that all remote entry devices operate at frequencies between 300 and 500 MHz, while all mobile phones, by law, operate at 800 MHz and higher.
It's apples vs. oranges, in other words. Your mobile phone can no more broadcast the type of signal needed to unlock a car door than your remote key is capable of dialing up though no one can predict what miracles the future may bring.
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