What is the reason why Apple 12 phone has no service?

Mobile phone communication is to send and receive signals through the network base station, and then communicate with the called party, such as the mobile phone shows no service may be related to the following conditions:

1. Mobile phone SIM card.

Poor contact with the shrapnel of the mobile phone card slot, resulting in the SIM card circuit can not work, and the mobile phone and the network base station can not communicate, at this time, you can remove the SIM card and wipe the SIM card gold finger with a cleaning cotton cloth.

, reinstall it.

2. The application software for the installation of the mobile phone is not compatible with the system, resulting in the system software turning off the modem in the mobile phone signal processing circuit.

At this time, you can turn off the phone and restart it, the modem in the mobile phone signal circuit will restart, and when the signal is normal, delete the suspicious mobile phone application software installed before the problem.

3. The SIM card of the mobile phone is not registered in the network, at this time, you can insert this SIM card into another mobile phone, if it also shows no service as the reason for the SIM card.

4. If the SIM card of the mobile phone is accidental, and there is no signal in the network signal coverage area, it fails to reconnect to search the network and merge the book, at this time, you can manually search for network registration under the menu of Settings - General - Network - Network Operator.

5. If the signal coverage of the mobile phone SIM card network operator is not available, you can change the location to an open area, and then check the mobile phone signal grid display, if the display is normal after changing the location, you can call the network operator service ** for feedback and complaints.

6. **The card has been used for too long, and with a valid certificate, you can go to the local business hall to reapply for a card.

The general reasons for the sudden lack of signal on the Apple 12 are as follows:

1.It may be a problem with the base band, which is a hardware failure, and you can go to the manufacturer for free to replace it.

2.Turn your phone off and restart it. Here's how:

Start by quickly pressing Volume Plus and then let go, and quickly press Volume Down and then let go, 3If you have just plugged and unplugged your SIM card, you may also encounter this problem, it may be that the SIM card is not in good contact, after turning off the mobile phone, it should be okay to reinsert the SIM card.

4.If you have just upgraded the iOS system, turn the airplane mode on and off. Repeat the operation several times and you're good to go.

5.The requirements for the after-sales free warranty are:1Bank of China is in insurance 2Non-man-made faults, water ingress, falls do not protect 3There are invoices.

6.If you don't have to protect it, you can also repair it, the motherboard problem is not necessarily to change the motherboard, a motherboard is composed of dozens of chips, and the general conventional chip can be a few hundred yuan, and there is no need to change the motherboard motherboard 34,000 yuan. Most of this is the baseband desoldering or the baseband power supply is replaced.

I've been working in the Apple Factory store, so I know a lot about them. The following diagram shows the motherboard baseband repair process for reference.

7.If there is a blank behind the "demodulator firmware" or an exclamation mark at the top right of the screen, it is basically a baseband problem.

If there is no service for the Unicom mobile phone card, there may be the following reasons:

1.The mobile phone card is not plugged in properly, and the contact is poor;

3.The mobile phone card, card slot or mobile phone terminal is damaged;

4.The status of the mobile phone card is abnormal (such as shutdown, closed account, etc.);

5.The mobile terminal does not support China Unicom.

Here are some things you can try:

1.Turn the phone on and off and restart it to test it;

2.Reseat the mobile phone card and check whether the card slot is loose or deformed.

4.Test whether the mobile phone card or terminal is faulty;

5.Verify that the status of the SIM card is normal;

6.Check whether the mobile terminal supports China Unicom.

The lack of service of the supplementary card of the Apple mobile phone may be that the button of the supplementary card was accidentally turned off, and the operation method is as follows: 1. Enter the settings page and open the "Settings" of the Apple mobile phone. 2. Go to the cellular network page, find and click "Cellular Network" on the page.

3. Modify the cellular number and click "Use as" as a secondary number on the page. 4. Turn on Enable this number, and turn on the switch of "Enable this number". 5. If other reasons are not useful, it may be that the service of the main card has expired, resulting in the secondary card showing no service, so you should go to the business hall for inquiry.

Apple 12 no service is generally caused by a poor mobile phone signal, you can restart the phone once, or look at it again in a different place.

Apple 12If there is no service, then you can try to reinsert the card, which may be caused by poor contact of the card slot.

I'm an Apple repair engineer, so let me tell you about it.

If there is no signal or the signal is weak, most of the problems are system, which can be solved in the following ways: 1. Restore the network settings first, and set General Restore to restore the network settings.

2. Update the iOS version. Most of the above two situations can be solved by these two methods.

If it still doesn't work, it's a problem with the machine's hardware.

Generally, it is baseband, baseband power supply and other chips.

There are also two ways to deal with this.

1.If there is an invoice for non-human dismantling and repair, you can go to the after-sales free warranty 2Man-made or parallel cargo planes can only be dismantled for maintenance.

This kind of repair hardware does not let you change the motherboard, there are dozens or hundreds of chips on a motherboard, and you only need to replace the faulty chip, 23,000 to change the motherboard, and only a few hundred chips can be repaired.

Suddenly there is no service, the entrance examination is that the mobile phone card is suddenly loose, or it may be a problem with the signal itself, or there is a problem with the mobile phone, you can restart it and try it.

If the signal is not good, there may be no service, the phone can be restarted or the SIM card can be reinstalled, and the signal of 11 is really not good.

Well, Apple 11 suddenly no service, it may be your card string, you can restart your **, if it really doesn't work, you can also take a look at your mobile phone card, and then um, get some locations, maybe this will be fine.

Apple 11 suddenly no service, it should be no signal, turn off five minutes after restarting to try.

When you say no service, you probably go to some remote area, or a basement or other place with a poor signal.

There is no service, it may be due to the phone suddenly no signal, you can restart it to try.

This may be a problem with your phone's network settings, you can reset the network settings, or restart your phone.

There should be no signal, so there is no service.

This should be a problem with his system cache, turn off the phone and restart it.

First, open [Settings] and find the [Airplane Mode] displayed in the first column;

Or find the [General] column;

Manually slide to the bottom and click Restore;

Select Reset Network Settings displayed in the third column to reset the network and restore the mobile phone signal.

First of all, one of the most easily overlooked problems for all of us is to check whether the mobile phone number is in arrears. If there is no arrears, please read on.

Apple 11 mobile phone** can't be called, the most common reason is that the current mobile phone signal is not good. Take individuals as an example, using Unicom numbers, often encounter poor signals in some places. As shown in the figure below, the mobile phone signal grid in the status bar is not displayed.

At this time, we can't play **.

What should I do if my iphone11 can't play**? iphone11 can't dial out** solution.

What should I do if my iphone11 can't play**? iphone11 can't dial out** solution.

What should I do if my iphone11 can't play**? iphone11 can't dial out** solution.

What should I do if my iphone11 can't play**? iphone11 can't dial out** solution.

If you still can't get the mobile phone signal through airplane mode, then the signal of your current location is really not good, and it is recommended that you change to an open place and operate again.

Also, if none of the above methods work, you can also try to turn it off and then turn it on. Restore the phone system to its initial state.

What should I do if my iphone11 can't play**? iphone11 can't dial out** solution.

Finally, there is another way, you can take out the phone card, wipe it, and then put it back in. Sometimes it may be caused by the loose mobile phone card and no contact number.

The mobile phone cannot be called**, and the absence of service may be due to the arrears of the mobile phone.

Of course, it is also possible that the signal is blocked because the area where the user is located is relatively closed.

If your Apple 11 can't play ** and there is no service, maybe you don't have a ** card plugged in. And there was no signal.

1.Damage to the SIM card leads to no service due to inability to read the SIM card, 2The hardware failure of the mobile phone leads to the inability to read the SIM card resulting in no service, 3

Software conflict resulting in inability to read the SIM card resulting in no service, 4There is no signal coverage in the area, resulting in no service.

5.It is recommended to bring the device to a regular repair center for repair, so as to avoid problems such as damage to the motherboard caused by damage to the mobile phone card slot.

Can't play **, no service is generally caused by no signal in the area.

If there is no service, it is generally a problem with the signal of the mobile phone, and the signal may not be good in the place where you are.

In this case, the iPhone 11 shows no service, which is generally caused by poor contact between the mobile phone and the SIM card.

You can go to the place that sells computers and ask someone to check it out to see what is fast.

Taking Apple 11, the system as an example, the reasons why the Apple mobile phone suddenly has no signal and no service are as follows:

1. The surrounding network environment is relatively poor, such as when entering the elevator, indoors or in crowded places, the mobile phone will suddenly have no signal.

2. If there is a problem with the SIM card, such as the wear and tear of the SIM card, it will also cause the mobile phone to have no signal and no service.

3. The mobile phone is a problem with the system software, so it shows no service.

The solution to the sudden no signal and no service on the iPhone is as follows:

First of all, try to surf the Internet in an environment with a good network signal to see if the phone has a signal again.

Secondly, check whether the SIM card itself is damaged, and if it is damaged, replace the SIM card in time.

Finally, use the phone system to the latest version and see if it is restored.

On top of that, you can turn airplane mode on for five seconds and then turn it off to see if you can use the internet. Or reset the network settings, open the phone settings, go to General, click Restore, and then click Reset Network Settings.

This method is suitable for most models of Apple brand phones.

Apple 7p plugs in the mobile phone card and shows no service.

Generally speaking, there are three scenarios.

1. If you have any problems with the card itself, you can try to change it to a new card or a different operator card.

Second, the hardware problem of the card slot, the card slot oxidation or fall deformation, resulting in the inability to read the card information, only need to replace the card slot.

Third, the motherboard problem is also the most serious problem.

Generally, the card is not read by the amplifier, baseband, and the like.

A motherboard problem doesn't mean you have to replace the motherboard.

There are dozens of small chip modules on the motherboard, and each set of chips controls a different function.

For example, control the acceptance model, store information, output image, ** current and so on.

Among them, the power amplifier is used to receive the model, and the baseband is used to analyze the signal. These chips can be repaired and replaced.

The cost is much cheaper than changing the whole thing.

I've been working in the Apple repair center, and I know these very well, and the following picture is the chip diagram of the Apple motherboard, for reference, I don't know how to ask for my nickname.

iPhone 8 is partially repaired, and there is often no service, and it takes a few minutes to understand the repair.

1. First check whether there is a problem with the mobile phone card, insert another mobile phone card, and detect whether the mobile phone card cannot be used, resulting in no service for the mobile phone.

2. If there is no problem with checking the phone card, find and open the settings on the phone.

3. Find the airplane mode option in the settings, click the button on the right, and wait a few seconds before turning it off.

4. If the phone still shows no service, find the general option on the settings page and click to open.

5. Scroll down to the general page and select the restore option.

6. Find the reset network settings on the restore page, enter the boot password, and the restoration will be successful.

The description is **, change to a single card, and the signal problem will be improved.

That's because there is no signal in the current area, and moving to another place just needs to show the signal.

There are several possible reasons why your phone suddenly has no signal:

First: the signal is relatively weak, resulting in no signal, change to a place with a better signal Second: accidentally set to airplane mode, you need to be able to open the control center, first turn on the airplane mode, and then turn off the airplane mode, so that the mobile phone can search for the mobile network signal again.

Third: It may be that the SIM card slot is damaged, and you need to replace the SIM card slot, try Fourth: Hardware problems, you need to send it for repair.

Fifth: You can go to the location on the map for consultation and maintenance.