What happens when the phone is turned on and the SIM card is changed? What's the impact?

Does the SIM card of mobile phone support "hot plug"? That is to say, can the SIM card be replaced when it is turned on, and what impact will it have on the opponent's chances of winning? Let me talk about it in detail.

Hot-plug is hot plug, which allows users to take out or replace damaged hard disks, boards and other components without shutting down the system and cutting off the power supply, thus improving the timely recovery ability, expansibility and flexibility of the system.

Some mobile phones support hot plug of sim cards, which can be plugged and unplugged with electricity, so that users can replace SIM cards without turning off their mobile phones, which has no influence on mobile phones. This problem was considered at the beginning of mobile phone design. SIM card holder has a detect pin to judge whether the user inserts or pulls the card, so as to check or stop the card, such as iphone.

Some mobile phones do not support hot plug of SIM cards, and the card checking process will only be started when the modem is turned on. If the card is not detected when the phone is turned on, the card checking process will not be performed in the future. This phone does not support hot plug when replacing SIM card.

In this case, we can turn on the flight mode of the mobile phone, take out the SIM card, replace it, and then turn off the flight mode.

In short, not all mobile phones support hot plug of sim card, some mobile phones support hot plug of SIM card at the beginning of design, and some do not. When the sim card is turned on, it will not damage the mobile phone motherboard or the SIM card.

We are very worried that my SIM card will not be damaged if I insert it when I turn it on. With this question, I conducted a test. The results proved that it had no effect, and even it was quickly recognized and the search was completed.

In fact, to understand this truth, what we need to do is what is the use of SIM card? Or what is a SIM card?

SIM card, user identification module, because it always exists in the form of a card, so we are used to calling it SIM card.

But don't underestimate this card. In this card, there are five modules, such as CPU, ROM, RAM, EEPROM and serial communication unit.

When we insert the SIM card into the mobile phone, the power port of the mobile phone supplies power to each module in the SIM card, and then the mobile phone can identify it through the cooperation of * * * *, so that others can locate your position and so on.

So, when the phone is turned on, does it really have no effect? My mobile phone has proved that this plugging and unplugging method does not affect the power supply of our SIM card, or strong current will affect the mobile phone and so on. So you don't have to worry.

However, we still suggest that you try to replace the SIM card after turning it off. On the one hand, it is to eliminate hidden dangers. After all, SIM is likely to burn the card without turning it off. On the other hand, it may affect the signal.

Mobile phones now support hot-swappable cards for three reasons:

1, now the storage of the mobile phone is built-in, and there will be no memory loss;

2. The mobile phone card is only used to receive signals and access the network, and will not have any influence on the mobile phone;

Generally, our mobile phone card is rarely inserted, and it will not be changed several times a year, so normal card insertion has no effect.

First of all, in a popular way, inserting or pulling out the sim card when the mobile phone is turned on is called hot plug.

Many people may have heard that the hot plug technology was originally on the PC side. In order to repair the faulty parts more conveniently, it is very common to hot plug the USB flash drive. The hot plug technology used in mobile phones mainly refers to plugging and unplugging calling cards, that is, sim cards. I don't remember exactly when it started to be used on mobile phones, but Apple had already used hot-swappable sim cards on iPhone4, which were not supported by previous brands such as Samsung, Sony and LG.

Since hot plug technology has been developed and used in the consumer field for so many years, there is no need to worry about how much damage it will cause to mobile phones. I have used both iphone and several Android phones, and hot-swapped sim cards several times. So far, I haven't seen anything unusual when using this function, but some mobile phones may let you restart even if the sim card is hot-plugged, but it doesn't hurt the mobile phone itself.

In recent years, mobile phones listed on the market all support hot plug of SIM cards. According to the official explanation, in order to prevent the user from plugging and unplugging the SIM card when turning on the phone, the old mobile phone cannot and will never display the operator signal!

I have glory 6 and Huawei mate 10Pro, among which glory 6 does not support hot plug of SIM card. When the card is inserted in the power-on state, no signal will be displayed in the upper left corner. You must restart the phone or switch flight modes. Huawei mate 10Pro supports hot plug of SIM card. Insert the SIM card in the boot state, and the signal will be displayed automatically after a few seconds!

Therefore, changing the SIM card when the phone is turned on will not cause any impact, except that the operator signal cannot be recognized at most!

The reliable answer is that most mobile phones can replace SIM cards when they are turned on. Some early 3G mobile phones, as well as 2G mobile phones, do not support hot plug of SIM cards, and SIM cards can be replaced when turned on.

Generally speaking, SIM cards, like the U disk we usually use, all support hot plug. As we all know, the computer can be plugged into the USB flash drive when it is turned on, and it does not need to be turned off when it is unplugged, which will not cause any damage to the USB flash drive. Similarly, the SIM card that supports plugging and unplugging can also be replaced in the boot state, and it will not cause harm to the SIM card.

In fact, mobile phones also have hot plug technology for SIM cards. If the mobile phone does not support hot-plug SIM cards, it is necessary to restart the mobile phone or start flight mode to identify the newly inserted SIM card after replacing the new SIM card in the boot state. Otherwise, the phone will always be in a state of no signal.

In contrast, a mobile phone that supports hot plug of SIM card will automatically identify the new SIM card number after directly replacing the SIM card in the power-on state without any operation.

In fact, most 4G mobile phones support SIM hot plug, even thousands of mobile phones. Therefore, it is not necessary to turn off the phone when replacing the SIM card, and it can be replaced directly without damaging the SIM card. Even if the mobile phone does not support hot plug of SIM card, it is enough to enable flight mode to re-identify SIM card.

I often pull out the SIM card when it is turned on, which won't make any difference. In fact, I did the same thing before, not only the current smart phone, but also the earlier old features.

But I personally don't recommend that you do this, because not all models support plugging and unplugging SIM cards in the boot state.

1, SIM interface specification does not support hot plug.

When we usually open a card, we generally call it hot plug, which is familiar to everyone. Many devices used in computers, such as USB flash drive, mobile hard disk, HDMI interface, etc., all involve hot plug.

With the development of technology, all the equipment above now supports hot plug, but there is no big change when it returns to SIM card, because the standard specification of SIM card was formulated 20 years ago, and this specification has not been adjusted so far, and everyone still follows the old specification.

2. Some mobile phone manufacturers have hot plug settings.

Of course, although the specifications of the SIM card have not been modified, many intentional mobile phone manufacturers have taken preventive measures against the hot plug of the SIM card when designing to prevent some reckless users from burning the SIM card due to hot plug.

At present, the hot plug of SIM is usually realized by software, such as reading and writing SIM cards regularly (about 5- 10 seconds). When it is found that the SIM card cannot be read or written, the system will think that the SIM card has been pulled out, and perform corresponding power-off operation to avoid burning the card.

In addition, some SIM cards are added with corresponding hot-plug circuits, and users can plug them in and out directly.

3. Possible consequences of hot plug of 3.SIM card

This has actually been mentioned in the previous content, that is, burning cards! When plugging and unplugging the SIM card in the boot state, because the power supply and port communication of the SIM card are still working, plugging and unplugging the SIM card suddenly with electricity may cause the SIM card chip to burn. At this time, you can only go to the operator to reissue a card.

Views of Lscssh technical officials:

As far as the mobile phones I have used are concerned, the smart phones with hot-swappable SIM cards include iPhone5s, Nubian Z 17mini and Glory Play 7C. Nowadays, many mobile phones are clearly marked as hot-swappable SIM cards (see above). The topic owner may wish to look at the following by himself, or directly consult the customer service of the mobile phone manufacturer, and there should be a clear answer.

Hello! I'm glad to answer your question. What happens when the phone is turned on and the SIM card is changed? What's the impact? First of all, it depends on whether your mobile phone supports hot plug? If it is supported, the card can be changed when it is turned on, but the chip of the SIM card may be damaged. To be on the safe side, you'd better turn off your phone before changing your card.

Sim card, under normal circumstances, supports hot plug, but the memory card will not work, and the probability of failure is very high.

Nowadays, mobile phones support hot plug. no problem