Why does the iPhone suddenly show no service?

It may be due to the SIM card, or it may be a problem with the system or hardware of the mobile phone.

1. There are many reasons why the iPhone shows no service, it may be the reason of the SIM card, or it may be the problem of the mobile phone system or hardware.

2. Sometimes the mobile phone will be in a state of no service due to the poor network of the surrounding environment, at this time, we turn on the airplane mode and then turn off the airplane mode, and the system will search for the network signal again. Open [Settings] on your phone, then turn on the button to the right of the [Airplane mode] option, wait a few seconds and then turn it off.

3. After the iPhone has been used for a long time, the mobile phone may not be connected to the network due to some reasons of the system itself, we can solve the problem of no service by restoring the network settings and restoring to the default factory settings, or by restarting the mobile phone. First, tap the General option in your phone's Settings.

4. Then at the bottom of the [General] interface, find the [Restore] option and click to open it.

5. Then on the page that opens, click the [Reset Network Settings] option, and then enter the phone password to restore the network.

6. If there is still no service status after restoring the network settings, then we can try to turn off the phone first and then restart it to see if this problem can be solved.

7. If the mobile phone cannot be connected to the network, it may also be a problem with the SIM card of the mobile phone. We can remove the SIM card to check whether it is damaged or worn, or find another SIM card to insert into the iPhone 6 mobile phone to try to solve the problem. If it still can't be solved, then you can deny the reason for the SIM card.

8. Due to some vulnerabilities in the iOS system of Apple mobile phones, these vulnerabilities may sometimes cause the mobile phone to be unable to search the network and display no service status. We can update our phone's system to the latest version, which can generally solve this problem. We can find [General] from the [Settings] of the mobile phone and click [Software Update] to update, or connect the computer iTunes to update.

9. If the above methods can't solve this problem, it is likely to be a problem with the hardware of the mobile phone, and it is best to go to Apple after-sales service to request processing.

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. The SIM card of the mobile phone is in poor contact with the shneme of the mobile phone card slot, resulting in the failure of the SIM card circuit and the inability of the mobile phone to communicate with the network base station.

2. The mobile phone is incompatible with the system due to the application software for installation, resulting in the system software closing the modem in the mobile phone signal processing circuit, at this time you can turn off the mobile phone and then restart, the modem in the mobile phone signal circuit will be restarted, and after 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.

If the mobile phone suddenly shows no service, it may be that the environmental signal is too poor, change the environment or no service, it may be a SIM card reading problem, try to reinsert it.

The signal of the Apple mobile phone is very poor, and sometimes when you go to a place with a weak signal, it will show no service, you can turn off the network and try again.

One is that there is really no network signal, and the other is that there is a problem with the mobile phone system.

It is estimated that the signal is not good, or the mobile phone card is not plugged in properly.

1.Confirm that you are currently within range and check if your device is blocked from receiving cellular service.

You can try turning airplane mode on or off, or restarting your device;

2.Check for carrier updates:

Manually check for carrier settings updates and install them:

Make sure your device is connected to a Wi-Fi or cellular network.

Tap Settings - General - About This Mac. If an update is available, you'll see an option to update your carrier settings.

To see the version of the carrier settings on your device, tap Settings - General - About This Mac, then look next to Carrier.

3.Reinstall the SIM card:

Remove the SIM card and put it back in. If you have another phone with you, you can insert the SIM card into your phone to detect if the card is damaged.

If your SIM card is damaged or won't fit in the SIM tray, you'll need to request a new SIM card from your carrier.

4.Reset Network Settings:

Go to "Settings" - "General" - "Reset" - "Reset Network Settings". This action also restores Wi-Fi network and password settings, cellular network settings, and VPN and APN settings that you previously used.

5.Update your iPhone.

Update your iPhone to the latest version of iOS.

If the above solutions cannot solve your problem, you need to contact Apple after-sales service to repair the device.

iPhone 7 users should note that Apple has officially confirmed that a small percentage of iPhone 7 devices may show "no service" in the status bar (even within cellular coverage) due to a malfunction of a component on the motherboard.

The affected devices were manufactured between September 2016 and February 2018 and were sold in Chinese mainland, Hong Kong, Japan, Macau, and the United States.

If your device exhibits any of the above symptoms, Apple will repair your device at no additional cost. Before providing any service, a technician will check your iPhone to verify that your device is eligible for this program. This plan is only available on iPhone 7.

Here are the three models that are eligible for this program, and you can check the models on the back of your iPhone 7:

1. You can click "Operator" on the "Settings" interface in your phone to re-modify it and change it to "Automatic".

2. Turn airplane mode on and off. In iPhone5s, swipe up at the bottom of the screen to open the shortcut panel, and then turn on airplane mode, of course, you can also turn on airplane mode in "Settings", after turning it on, wait for 5 seconds and then turn off airplane mode to see if it solves the problem.

3. Restart your iPhone5S, press the power off button in your phone, then turn off your iPhone5s by swiping the screen, then restart your phone and see if it solves "No Service"!

4. Of course, taking out the SIM card and verifying if it is a valid SIM card manufactured by the operator can also solve this problem. See if the removed SIM card has been damaged, worn, or modified, and then reinsert it.

5. Update and upgrade your iPhone5s, connect your iPhone5s to iTunes, and then upgrade your device system to the latest iOS system through iTunes. Of course, you can also go to "Settings" - "General" - "Software Update" to update and upgrade your iPhone5S.

According to the information you provide, if you mean that the mobile phone cannot be used "without service", you can detect it in the following ways:

1.Please make sure your phone is not set to airplane mode;

2.Please confirm whether your mobile phone is in arrears;

3.You can go to a place with a better signal and turn it back on;

4.You can change the card on the mobile phone to try, or put the card on another mobile phone to try, if it can be used normally, it is recommended that you go to the business hall to test, if it still does not work, it may be caused by the mobile phone system, you can go to the mobile phone repair point to test the mobile phone.

What to do if the iPhone suddenly goes out of service.

The iPhone keeps showing no service This is, probably because your phone has not been activated, if it is activated, you turn on the airplane mode, then turn off the airplane mode, restart the phone to try.

Is the SIM card in arrears?,If it's in arrears, it's no service.。 If there is no arrears, the SIM card is not installed correctly, and the situation of poor contact is ruled out. Also, if you don't have a signal in that place, this problem may also occur.

Wait for a while, if it doesn't work, restart the phone, and if it doesn't work, you have to reflash the system, or find after-sales service to show you.

2. Restart your phone.

3. Reset the settings.

There are several situations where the phone is not serviced:

1.Signal blind spots, such as in elevators or some very remote corners, there will be no service, but sometimes after returning to the normal signal area, the mobile phone cannot automatically search for the signal, so you need to manually restart or turn on the airplane mode and then turn it off to search for the received signal again.

2.The mobile phone system update problem, the mobile phone system baseband version is too low.

3.Whether the phone card slot is damaged.

4.Whether the mobile phone card is firmly inserted.

5.The hardware facilities of the mobile phone are not broken.