Today with everyone to popularize a cold knowledge that most people do not know, useless new knowledge has increased ~
Whether it is a former feature phone or a current smartphone, there will be two buttons in the dial box, "*" and "#", which are the asterisk key and the pound key. These two keys and 0-9 numbers are arranged in the phone, and we almost use these two keys in real life, so why do they exist? What does it do?
1Why are asterisk keys and pound keys designed?
The asterisk key and the pound key appear in the mobile phone button for two reasons, one is for the sake of beautiful arrangement, and the other is to reserve the function keys later.
The mobile phone dial pad adopts a 3*4 rectangular layout, if you remove the two keys, only 9 numbers are left, no matter how it is arranged, it will be ugly. At the same time, the design of these two keys has the meaning of adding functions for the future.
What are the functions of the 2 asterisk key and the pound key?
These two buttons can not be underestimated, the functions are very much, we start from the mobile phone just appeared in the big brother period.
01 Big Brother's phone bill saving function
In the era of big brothers, it is already a very worthy thing to show off if you can have a big brother mobile phone. But at the same time, at that time, making calls was also very expensive, and the cost of a long-distance call per minute was about six yuan, which was unacceptable now, not to mention that period.
The role of the asterisk key is that when you want to call the other party, add a "*" prefix to give you a 50% discount, which shows the importance of this button.
02 Landline phone callback and alarm function
Landlines can set alarms, do you know this? The operation method is also simple, just add "*55*" before setting the time. Assuming that the alarm time is 6:30, you can press "*55*0630".
Moreover, friends who have experienced the landline era should know that the asterisk key and the pound key are often used in "view phone" and "call back". When you don't receive a call in time, just click back and you can call back immediately without entering a phone number.
03The pause function of the phone booth
When the public telephone booth is still popular, the phone card is used to make calls at the phone booth, and each step of the operation needs to press the "#" key to indicate the end, and then proceed to the next step, which is a pause or end.
04 Unlock function of the feature machine
We now unlock our phones, using fingerprint unlocks or face unlocks. During the functional machine period, many elderly machines were unlocked with asterisk keys and menu keys. And this is also to prevent the mobile phone in the pocket of the mistaken touch set, remember that at that time will often receive a call from the elderly at home, after inquiry learned that it was a mistake to touch the call.
05 Dial-up forwarding and query function of smartphones
Larger businesses generally have host numbers and extension numbers, which are needed to transfer when we need to call the extension number. And when calling operators, they should often choose according to their voices to carry out different services.
Moreover, these two keys can also be used as query functions.
A: Enter "*#06#" in turn to check the IMEI code
B: Enter "*#0000#" to check the specific model of the phone, the date of system update, the date of development, etc.
C: Enter the *#*#121314#*#* to test the functions on your hand, such as speakers, buttons, or earpieces.
D: Enter *#*#2846579#*#* to enter the background of the mobile phone, view the mobile network information, and restore the factory settings.
Do you know these functions of the asterisk key and the pound key?
The image comes from the Internet