If there are no asterisk key and pound key, there will be only 10 keys in total. If arranged in two columns, it will be too long and looks narrow and ugly. If arranged in three columns, there will be an extra button. Sometimes you will ask again, why can't there be two more buttons, but there must be a sequence...

Just kidding, then why are the buttons on the mobile phone Are there these two buttons? In addition to calling customer service and following the voice prompts to perform the next step, these two buttons are also used in banks to withdraw money using passbooks. In addition, in Android phones, these two buttons still have many hidden features. Function:

First, open the dialing menu. 1. (*#06#) Check the IMEI number of the mobile phone, which is equivalent to each of us’ ID number. Only genuine mobile phones will have such a string of numbers, remember! Do not send this string of numbers to random strangers. 2. (*#0000#) Check the status information of the mobile phone, such as the model of the mobile phone, the system development date, whether the current system is updated, and the update date and status. 3. After entering (*#*#2846579#*#*), you can enter the background of the phone, view network information, restore factory settings with one click, etc.

4. (*#*#121314#*#*) Test the function of the mobile phone. This function is best used after class or when no one is around, otherwise it may start suddenly during class. Vibration is used to detect all aspects of mobile phones, such as mobile phone buttons, vibrations, earpieces, speakers, etc. 5. (*#6776#) Checking the manufacturing date and version of a mobile phone is like checking which hospital a baby was born in and who its parents are.

The above buttons may not be applicable to all brands of Android phones. At the same time, people who are unfamiliar with mobile phones must use them with caution, especially when restoring factory settings. If the phone has no backup and is not ready for restoration, It's best not to mess around.

With the development of mobile Internet, smart phones can be said to be more and more popular. Almost everyone has one, and many people even use two mobile phones at the same time. When we often use mobile phones, we will find that there are two redundant keys on the dialing keyboard. Yes, they are the * key and the # key. Plus 0 to 9, there are 12 keyboards. These keys appear when we dial, but we rarely use these two keys. So, why do these two keys appear on every smartphone or feature phone? What do they do?

This starts from the origin of the telephone. When the telephone dialing keys were designed, there were only 10 numeric keys from 0 to 9, but 3 3 had one more and 3 4 had two less. Untidy. In order to achieve a neat arrangement, that is, a 3*4 arrangement, the engineers added two keyboards, * and #. These two keyboards were also prepared for later functions, and were indeed used.

For example, in the landline era, many young people probably don’t know that when making calls in phone booths, you needed to insert a phone card, and the # number was used to confirm the insertion of the phone card. Moreover, * and # can also play many functions in setting up the keyboard, such as checking call records/callback/redialing and setting alarm clocks. Of course, this is only in the era of landline dialing.

In the era of feature phones, that is, the era of Nokia mobile phones, the * and # signs also played a huge role. For example, the * key was needed to debug the input method. When calling operator or bank customer service, these two keyboards also play a huge role. For example, entering a password ends with the # keyboard, or press the * key to return to the previous menu. Without these two keys, it is difficult to make a call. Customer service.

In the mobile Internet era, although physical keyboards are no longer used, virtual dialing keys still exist, and there are still * and # keyboards. And these two keyboards still play a huge role and can perform quick operations. For example, to check the IMEI of a mobile phone, just press *#06#. You can also press certain characters to query the specific information of the mobile phone and enter the engineering mode. You can also format the mobile phone, or perform communication operations such as call transfer. Many of them are hidden functions. , need to dig step by step.

However, with the development of mobile Internet/cloud computing/artificial intelligence, people are using smartphones less and less to dial, which means that the opening rate of these two keyboards has changed. Less. Moreover, many functions can only be controlled by the voice assistant. There is no need to enter so many codes for queries, and the voice assistant can completely free your hands, and the asterisk key and the pound key will sooner or later exit the stage of history.

Whether it is the physical buttons of a feature phone or the touch screen buttons of a smartphone, in addition to the 10 digits from 0 to 9, you will also find two special symbols, one is "*", One is the "#" sign. These two symbols are placed at the lowest left and right ends of the dial pad. If they are not mentioned specifically, people will really ignore their existence. So, what is the use of these two seemingly useless physical buttons or touch screen buttons?

Talking about the design of the telephone, we can trace it back to Bell. An accident caused by an accidental splash of sulfuric acid accelerated Bell's development of the telephone.

The "*" and "#" signs already existed when Bell designed the phone. One theory is that they are for aesthetics. No matter how they are arranged, a simple combination of numbers does not look very good. After adding these two symbols, it can be more neatly arranged. Arrange; one way of saying it is redundant design. Although these two symbols had no specific practical function at the time, it was understandable from an industrial design perspective to leave room for the future.

Of the two opinions, I personally prefer the second one. Beauty is dispensable. Things that look beautiful now are just a continuation of usage habits. There is room for product design, which will facilitate future upgrades, especially for industrial products.

The "*" and "#" signs are different from specific numbers, which provides convenience for special applications of telephone calls in the future. Different functions can be achieved through special combinations. Let’s take a look at the subsequent applications!

Someone mentioned Mobile Phone and it is said that adding "*" before dialing the number can save on long distance charges. Assume that the charge before adding "*" is 1.5 cents per minute. After adding "*" dialing, it will be reduced to 70 cents per minute. Big Brother is too old for me, and even at that time, I didn't seem to be able to afford it. However, I do remember that adding "*" can save long-distance charges. This was still the era when flip phones were popular.

So far, we have entered the era of smartphones. So what special functions have been developed by the "*" and "#" numbers?

The combination of special symbols can help us query some services. The more commonly used ones are *#06#, which can query the IMEI of the mobile phone, which is what we often call the USSD code. Of course, the functions of the USSD code are not limited to this. There are many more applications, including querying mobile phone information, starting services, WLAN, Bluetooth testing, etc. Those who are interested can query the USSD code by themselves and try to use it.

The "*" and "#" signs also play a significant role in some artificial voice interactions. For example, after entering a special number, please end with the "#" sign. Special symbols play a definite role here. In addition, what other special and interesting applications are there for the "*" and "#" signs? Everyone is welcome to leave a message for discussion.

Many things we encounter in daily life are often ignored by us because they appear too frequently, just like the * and # keys that appear on mobile phones. I encountered someone asking such a question today, and I felt very sad. Interesting, let’s find out. The origin of the * key and the # key can be traced back to the invention of the telephone. Everyone knows that Bell invented the telephone. When the telephone dial was designed, the 10 numbers 0 to 9 were placed on the dial. No matter how they were placed, the Neat, in the end they adopted a 3x4 arrangement, and the two missing seats were occupied by the * key and the # key. At the same time, they also considered that these two universal keys would be added with special functions in future designs. In fact, they later It is indeed widely used.

The * key and the # key have always been used: on early landline phones, the alarm clock function was set by combining the * key and the # key with the number keys; there were also former public telephone booths. Voice prompt operations are performed by inserting the * key and # key to play the role of turning and pausing. From the current point of view, this is also the most important role now; when we usually connect to the 10086 voice service, the * key and # key are required to participate. to complete the operation; and the most commonly used one is to input *#06# to check the IEMI code of the mobile phone to identify the authenticity of the mobile phone. Although we don’t use these functions much, it is really not possible without the * key and # key. Of course, it is not only for mobile phones, but also for banks. There are * and # keys on many instruments with digital dials in cash machines and ticket vending machines.

As smartphones become more and more powerful, when the physical keyboard is moved to the smartphone screen, the * and # keys are not abandoned, but play more roles. . The originally designed "universal key" began to become truly universal.

Uninvited! Let me "Happy and Laughing Facts" answer this question for you!

I think everyone should know that the asterisk key and the pound key come from the telephone invented by Bell. At that time, the asterisk key and the pound key were added to the telephone dial pad.

In fact, when it was first designed, the designer couldn't figure out what to use it for, so he just thought of leaving it for future development. Later facts proved that these two keys did play a big role. For example, in the 1980s and 1990s, mobile phones were not that popular at that time. Making calls mostly relied on public phones, which required the use of IP cards and the like. At this time, you need to use the pound key at each step of the operation to indicate pause or conversion.

Later, when mobile phones became popular, these two keys had more functions. For example, on the candy bar Nokia at that time, the lock screen and unlock were both function keys + asterisk keys.

Now, as smartphones become more and more powerful, when the physical keyboard is moved to the smartphone screen, the asterisk key and pound key play more roles. .

Because of this, and because there are so many mobile phone brands now, the tic-tac-toe and rice-zip keys on different mobile phones have different uses. Differences:

1. The biggest one is for auxiliary functions. For example, to check the serial number of a mobile phone, press *#06*. To use a smart phone, press *#7370*.

2. Generally, pressing and holding the tic-tac-toe key switches the scene mode. As for the rice key, most mobile phones use it to check the phone serial number or to lock the keyboard.

3. Some rice-zig-tac-toe keys and tic-tac-toe keys have special uses. The tic-tac-toe key can quickly adjust silent mode or normal mode. In the calculator, the tic-tac-toe key can be pressed to produce a decimal point, and the tic-tac-toe key can be used to select punctuation marks.

4. The tic-tac-toe key is the lock screen key. When sending text messages, the tic-tac-toe key is the spelling switching key, and the tic-tac-toe key is the punctuation mark enable key. etc.

From this point of view, the originally designed "universal key" is truly universal.

Thank you! You can share it if you like it!

See this question and tell me something interesting. I was just with my girlfriend at the time, and when I was sending her back to the dormitory at night, my phone suddenly vibrated. I opened it and took a look, and saw that it was a push message from a certain Guancun APP. The push message was disgusting. Is the content there? Night chats, etc. I can’t remember the details.

I didn’t care at the time. I clicked to clear the notification and put the phone in my pocket. When I sent her to the dormitory downstairs, I found that she was much colder to me and said something cool about me. He went back first, turned around and left me messy in the wind. I felt inexplicable at the time. Monk Zhang Er was confused. How did I offend her again?

With doubts, I returned to my dormitory and sent her a message asking her what was wrong. She didn’t say anything at first, she was just unhappy and felt like something was wrong. I gradually became angry too. What did I do? What is this for?

It wasn’t until we were about to quarrel that she vaguely said that she saw the night chat on my mobile phone... She thought I was not serious and secretly played this behind her back. I was confused at the time and was speechless. For a while.

I said it was a push message from the APP. Didn’t you see the icon? Then I took a screenshot and sent it to her, but she said she only saw the words "Night Chat". . .

I thought for a while and felt that this was not okay. I couldn’t be misunderstood like this. I had to prove myself. So I said to her, just wait a moment and I will find a way to prove it to you.

After hanging up the phone, I quickly searched on major websites for how to find the push history record of the mobile APP. I searched for a long time, but unfortunately failed. I couldn't find it.

After thinking and thinking, I finally thought of the cell phone dialing keyboard technique I had seen before, so I came up with the following method.

Enter *#*#4636#*#* on the mobile dialing keyboard to view mobile application usage statistics. It will jump to a page with application usage statistics. Click on it and you will see Get very detailed information, including the name of the application, the last time it was used, the usage time, etc.

So, the matter was resolved happily. As expected, the next day, the APP pushed the same message again, so I uninstalled it decisively.

Now, it is more convenient to check the usage status of mobile applications. Both MIUI and EMUI have implemented this function separately.

Closer to home, the * and # on mobile phones were created for specific services. For example, when making international calls in the past, the plus sign of the extension number was replaced by * or #, and the previous IP card was used for public purposes. Phone, * and # have the function of indicating pause and conversion characters.

Today, * and # are mainly used in combination with numbers to allow mobile phone manufacturers to customize multiple functions, making it easier for developers to view mobile phone information or test mobile phone functions.

The biggest ones are used for auxiliary functions. For example, to check the mobile phone serial number, press *#06*, to press the soft grid of a smartphone, press *#7370*, or other hidden functions of specific mobile phones, as well. It can be used for advanced calls, such as checking the phone bill, you need to press the numbers +* or #, etc.

Many people may be curious. Although the mobile phone number only consists of 0-9 digits, why is there still a dial button? Want to design the # key and * key? If you don't use it when dialing, what are these two keys used for?

In fact, I didn’t want to know about it. After I got to know it, I found that the * and # keys on the mobile phone also hide many functions, which will make us feel enlightened. Let’s take a look!

The landline era helps to set up and cancel some functions:

I remember that in the early days of using landline phones, you could set the alarm clock function. The operation is inseparable from the * and # keys.

For example, if some are *55*, you can set the alarm time according to the prompts. For example, if you want to set the time to get up at 7:30 in the morning, you can press: *55*0730#. The phone will ring when the set time comes.

If you want to cancel the alarm, you can also cancel it by combining some numbers and these two keys. Of course, the operations set up by each phone may be different, and the buttons used will naturally be different.

In addition to the alarm clock function, there are other functions such as checking phone calls, calling back, etc. During these settings, you need to use the # key and * key to complete.

The "pause" function in the phone card:

In the 2000s, when smartphones were not so popular, the most popular thing was to use the phone card to Call family and friends from public phone booths. It’s the kind of 201 card and IP card (which shows your age), and those born in the 8090s should be familiar with them.

When using this type of phone card, there will usually be a voice prompt for each operation step to press the "#" key to end and continue to the next step.

It can be said that the # key and * key on the phone at this time play the role of pause or conversion.

The transfer function during normal dialing:

In the era of smart phones, the most direct function of the # key and * key is actually for transfer .

For example, when we call some operators’ customer service, bank customer service and other officials, we need to use these two keys to perform various services, input conversion, confirmation, end, interval operations, or in When dialing the company's official phone number, these two keys are also used to transfer to the extension number and so on.

Special code in the era of smart phones:

After the development of the times and the continuous advancement of technology, many manufacturers have also made various changes to these two buttons. This design is used as some special codes to facilitate us to enter the system settings more quickly.

Or you can perform some in-depth queries, settings, etc. on your phone.

For example, by entering different codes for different models of mobile phones we mentioned at the beginning, you can quickly test various functions of the mobile phone;

For example, enter some specific codes (such as most Android users enter *# *#4636#*#*), you can check what others have done with your phone;

For example, on most Android phones, you can check the IEMI code of your phone by just entering *#06#.

Nowadays, the functions of the # key and * key are constantly improving with the continuous changes of smart phones. Through various combinations of manufacturers, more powerful functions of mobile phones are satisfied.

In addition to these functions, what other functions do you know about the # key and the * key?

The origin of the * key and the # key can be traced back to the invention of the telephone. When the telephone dial was designed, the 10 numbers from 0 to 9 were placed on the dial. No matter how they were placed, they were not neatly placed. In the end, a 3x4 arrangement was adopted, and the two missing seats were occupied by the * key and the # key. At the same time, it was also considered that these two universal keys would be added with special functions in future designs, and they were actually widely used later. application.

To check the IMEI (ID card) of your mobile phone, enter *#06# to find out. Every mobile phone has an ID card, so I won’t post a picture.

Enter ＊#＊#4636#＊#＊ to enter the test engineering mode (Huawei＊#＊#6130#＊#＊) (Apple phones also have it, but I don’t remember it, welcome to add)