A few highly secret features of mobile phones that very few people know about

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1. When you don’t want to be disturbed by others but still don’t want to turn off your device, here’s a way to make your number appear as a non-working number. Enter **21*999999#** and press the call button as you would when making a call. When someone calls you, your number becomes a invalid number. Enter ##21# again, and then press the call button – it works normally once more. PS: Mobile companies do not charge for this feature; it’s probably a vulnerability in the phone number system. You can try it out right away; if you find it useful, you can pass it on to your friends. It will come in handy when you don’t want to answer calls from that person who makes you sad in the future. 2. To determine the quality of your phone, first press *#06#, and a serial number will appear on your phone; then count the seventh and eighth digits. If your seventh and eighth numbers are the two corresponding numbers below, then the quality of your phone will be determined. 0.2 or 2.0 indicate very poor quality phones; 0.8 or 8.0 represent phones of slightly better quality. 0.1 or 1.0 denote phones of excellent quality. 0.0 means the phone was manufactured by its original manufacturer, making it the highest quality phone (original device). 1.3 indicates phones produced in Azerbaijan, and they are of extremely poor quality. An invisible backup battery: when your phone’s battery level is low, to allow it to continue working, press *3370#. The phone will restart, and after that, you’ll find that its battery level has increased by 50%. Once this hidden reserve of power is used up, you must charge it. When charging again, the invisible backup battery is also charged, allowing you to use this method again when the power level drops. I know this is very useful in emergency situations when the phone’s battery is low. 2. Did the car remote stay inside the car? Can your car be unlocked with the remote control? If possible, one day when you leave the car key fob inside the car and the spare key is at home, you’ll find it very convenient to have a smartphone. Use your phone to call a family member, keep your phone about a foot away from the car door, while the family member holds the key fob and presses the unlock button on it; this way, the car door can be opened. This method works no matter how far you drive from home. 3. Emergency situations: The universal emergency hotline that can be dialed from mobile phones around the world is 112. If you find yourself in an area without mobile network coverage and encounter an emergency, dialing 112 with your phone is the right choice, as it will automatically search for all available networks to establish an emergency call. What’s particularly interesting is that you can still dial 112 even when your phone is locked with a keyboard lock. Give it a try! 4. Was your phone stolen? There’s a way that even thieves can’t use it, hehe! To view your phone’s serial number, simply type * # 0 6 #; the 15-digit serial number will appear on the screen. Every phone in the world has a unique serial number, so make sure to write it down and keep it safe. If your phone is stolen one day, call your mobile provider and provide them with your phone’s serial number; they will help you block it, so that even if the thief replaces the SIM card, the phone cannot be used, and it becomes useless to the thief. If every mobile phone owner in the world did this, then stealing phones would be pointless. In Australia, the police have even created a database of stolen phones, so that if your phone is found, it can be returned to you. Essential for daily maintenance: 1. Don’t wait until your phone’s battery is dead before charging it. Generally, we tend to think that it’s better to completely drain the battery of a smartphone before recharging it, and this is basically correct. This is because most rechargeable batteries we used in the past were nickel-metal hydride (NiH) batteries, which have what’s known as a memory effect; if they aren’t fully discharged before being recharged, their lifespan will be significantly reduced. That’s why we wait until the last drop of electricity is used before starting to charge. However, most modern smartphones and general IA products use lithium (Li) batteries, and lithium batteries do not have the problem of memory effect. If everyone waits until all the power is used up before recharging, it will prevent the chemical substances inside the lithium battery from reacting, thereby reducing its lifespan. The best way is to charge it regularly so that it stays at full capacity at all times; this will ensure that your battery lasts for a long time. This is information obtained from the manufacturer, and it has been verified through our own testing. 2. Do not answer calls while the phone is charging! ! The reason is that answering a call while the phone is charging can pose a potential danger. In India, there is a 31-year-old man who works as a business manager at an insurance company. About ten days ago, he answered a call while his phone was still connected to the charger; a large current flowed through the phone in just a few seconds, causing him to fall to the ground. When his family found him, his fingers were burned, his heartbeat was weak, and he had lost consciousness. After being rushed to the hospital, the doctors declared him dead upon arrival. Mobile phones are the most commonly used modern invention these days. However, we must also be vigilant about the risk of death caused by instruments. 3. Do not use your phone when the signal strength is at just one bar. The transmission intensity differs by more than 1,000 times between when the signal is full and when it’s at only one bar. So... those who use their phones frequently should be careful... ^0^. Yesterday, I received very important information from a phone manufacturer: when you find that the signal strength of your phone is at just one bar, it’s better to hang up or use a payphone instead. Never continue talking non-stop, in an enthusiastic manner, without stopping... Why? As we all know, the electromagnetic waves emitted by phones are a source of concern. To maintain a decent call quality even in areas with weak signals, phones are designed to emit stronger electromagnetic waves. The transmission intensity differs by more than 1,000 times between when the signal is full and when it’s at one bar; the intensity can reach up to 0.6 watts. Just how strong is 0.6 watts? I can’t describe exactly what adverse effects this might have on your brain, but I can give two examples for comparison: 1) Turn up the volume of a small radio with a speaker diameter of about 4 centimeters to the maximum and hold it against your ear; the noise level in that case is usually around 0.25 watts, less than 0.5 watts. 2) Place your finger in front of a laser beam with an output intensity of 0.1W (which is equivalent to the energy of a ?D trunk line in fiber optic networks) for a few seconds; you will feel a burning sensation. Can you tolerate these two conditions for an extended period of time? 3) How then can you be sure that it’s safe to have electromagnetic waves with an intensity of 0.6W placed right next to your ear? 4.12593 + phone number = a trap. Do you store the phone numbers of friends who are outside your area in your contacts list using the format 17951 + phone number, instead of dialing them directly? In that case, the charging rate will change from 0.39 yuan per minute to 1.3 yuan per minute. I also checked with 1860, and their explanation was that if the number is stored in the contacts list, the system won’t be able to recognize it. Therefore, no rate discount is available; one must manually enter 12xxx on the keyboard each time. Is that the case for China Unicom users? The same goes for China Mobile and GTNet users. If you are a China Mobile user, once you become aware of the traps that China Mobile sets for you, you won’t be surprised anymore by why your phone bill keeps disappearing as if it had wings. You can get a discount by using the 12593+ phone number, but if you pre-save the “12593+ phone number” in your phone’s contacts and call using it, China Mobile will not recognize this as a call made through the discounted 12593 method, and instead will charge you as if it were a regular call. If you are on roaming, the two billing methods can differ by as much as 7 times! When I found out about this way of charging, I really didn’t know how to express my anger. Later, when I called 10086 for inquiries, if I hadn’t proactively asked about it, the lady with employee number 6608 would never have told me about such charging practices. 5. The parasites that drain your phone bill: Phones often send unnecessary messages without reason; it is highly recommended that everyone check whether they are affected by this issue. The simplest way to get rid of these parasites that steal money from your phone bill every month is to unsubscribe from them! On March 15th, China Mobile was forced to introduce a new service. If you are a customer of China Mobile, type the number “0000” and send it as a text message to 10086; within a few seconds, an automatic reply will be sent, listing all the text messaging services subscribed to on your phone, as well as the providers that deduct money from your account on a monthly basis, whether explicitly or secretly ； Type the number “00000” and send it as a text message to 186201 to unsubscribe from all text messaging services. 6. Don’t rush to make the call last exactly 1 minute. When we make calls, we often feel relieved that we manage to end it just before 1:00, but that’s not actually the case. According to a staff member from China Mobile, once a call reaches 0:55, that’s already counted as one minute; therefore, the time from 0:55 to 1:00 is charged as two minutes. 7. If water gets into your phone, remember not to press any buttons at all. Especially for mobile phones, pressing any button will cause water to flow along the circuit boards. The correct approach is to immediately open the back cover, remove the battery, and cut off the power supply, thereby preventing the motherboard from being damaged by water. This common sense is very important, so I’m sharing it with everyone to help keep their phones in good condition for longer. Learn it! For future use, just in case! 8. How to revive a phone battery? When the battery life of your mobile phone decreases (due to the memory effect or aging), would you buy a new battery to replace it? Next time this happens, save your money – here’s an effective method you can try: 1) Wrap the battery in newspaper, then put it in a plastic bag and store it in the freezer for three days (the newspaper helps absorb excess moisture). 2) After three days, take it out and let it sit at room temperature for two days. 3) After those two days, charge the battery fully and then install it back in the phone to test it (it’s estimated that this method can restore 80%-90% of the battery’s functionality). This information was provided by engineers from a well-known battery manufacturer, and those who have tried it report that it’s quite effective. Anyway, since the battery is almost dead anyway, and everyone has a refrigerator, why not give it a try? 9. Give your phone some “CPR”! Does the phone lose power frequently? Or does it run out of battery again soon after being fully charged? Must have wondered if the phone’s lifespan had run out? Don’t worry, it’s just a temporary ‘heart stop’; a small eraser is enough to bring it back to life! After removing the battery, use an eraser to clean the contacts on it (the brass pieces), then put it back into the phone – you’ll be amazed at the result! It actually came back to life! It still looks like a new one! It’s really useful; it provides a reference for everyone! 10. How to remove scratches from your phone screen. Do you often encounter scratches on your phone screen and not know what to do about them? I’ll share a useful trick with you all…. (I saw it on TV a few days ago.) Squeeze an appropriate amount of toothpaste onto a wet cloth, then apply it thoroughly to the scratched areas on the phone screen, moving back and forth and in all directions. You’ll find that the scratches on the screen disappear as a result…. It’s amazing, right?! What’s even more amazing is that after wiping it clean with a clean cloth or tissue, the phone screen becomes brighter. A chemistry professor from National Taiwan University explains that toothpaste is essentially an auxiliary tool for brushing teeth; it has an abrasive effect (which helps repair surfaces), as well as the ability to remove plaque and polish the tooth surface. Therefore, using it on the phone screen yields similar results.