Using android/ios phones to open / close car

Hi,

Is it possible to use android / ios phones to open car lock automatically?! (I mean with your NRFxx BLE chips).

I mean: 

1) No application on the phone or in background, Just bonding before.

2) When the user get into the car range with his phone the locks of the car will open automatically.

3) When the user get away from the car range the locks will locked automatically.

Is it possible and how ?!

B.r

Yuval.

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