It is totally unreliable and infeasible to remotely open the door by transmitting the unlocking signal from the mobile phone. From the perspective of scientific explanation, mobile phones receive and emit electromagnetic waves through analysis, while car keys release electromagnetic signals that cannot be transmitted through mobile phones.

As for the mobile phone, the driving and locking distance of the keys has increased, because the mobile phone has a built-in signal amplifier in order to let users receive signals in remote places. This amplifier can also act on the radio waves of the key at the same time. When the mobile phone is connected, the radio wave released by the key is amplified by the amplifier, resulting in an increase in the distance between driving and locking the car.

● Increase the key remote control distance. The mobile phone is effective.

In the process of testing, we also did another small experiment: only take a mobile phone to connect to the phone, put the key next to it and press on/off, but there is no one and phone next to the car. We found that the distance between opening and locking the car door has also increased, and the increased data is the same as the previous test.

● The practical significance of amplifying key signals by mobile phones.

There are two practical meanings that the mobile phone can enlarge the distance between the key to open and lock the car door.

1. When you take something from the car downstairs and find that you have forgotten your keys, you can call your family and ask them to open the door for you "remotely".

2. If your car is parked in a large parking lot and it is not convenient to find it, you can also dial a phone at will and find the car in a corner through the amplified signal.