Now I understand. It's worth learning.

I only understood that after using a mobile phone. Let's take a closer look.

1. What are the holes at the bottom of the phone?

There are many small holes at the bottom of the mobile phone. Take this mobile phone as an example. The small hole on the far left is used to hold the calling card and memory card. As long as you poke it with a needle, the phone card slot inside will pop out.

In the middle is the most common charging port.

And the right row of holes is the speaker.

Then there is a small hole, next to the charging port, what is this for?

This small hole is called a secondary mic by Apple and is used to absorb noise from the environment of the caller. In general, these small holes are used to help you reduce outside noise in everyday conversations. In the industry, these small holes are called dual-microphone noise reduction. This is equivalent to the phone having two built-in microphones.

Sometimes we may encounter a very noisy situation and it is difficult to hear the other person talking on the phone at this time. But this small hole can pick up our voice well and transmit it to the other side, while reducing noise and interference, making our voice clearer.

Cleaning Tips

Some of you want to use a sharp object to clean when you see dust in small holes, the most common method is to use a toothpick.

I never imagined that this little hole would be so important! Please spread the word to your friends who don't know yet!