Apple 11 can t read the phone card, and iphone 12 can t read the SIM card

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

1.Probably the baseband.

If there is a problem, it 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:

First quickly press Volume Plus and then let go, quickly press Volume Down and then let go, and finally long press the Side button until the iPhone turns back on and the Apple logo appears.

3.If you've just plugged and unplugged your SIM card.

You may also encounter this problem, it may be that the SIM card is in poor contact, after turning off the phone, it should be okay to reinsert the SIM card.

4.If you have just upgraded your iOS system.

Airplane mode is turned 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.

In Paula 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.

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.

8.That's it for now.,It's not clear and then I'll talk about it in detail.,v My ID with the same name.。

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

First quickly press Volume Plus and then let go, quickly press Volume Down and then let go, and finally long press the Side button until the iPhone turns back on and the Apple logo appears.

3.If 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.

There are several main possibilities that cause the iPhone to have no SIM card:

1. The SIM card is installed incorrectly.

2. The iPhone uses the smallest Nano SIM card, if you are a card clipping user, you may not have cut the card.

3. The SIM card is oxidized.

4. iPhone SIM card slot problems, such as internal rust and poor contact.

5. The hardware or software of the iPhone itself is faulty.

The solution to the iPhone no signal:

2. If it is a dual-SIM phone, please check whether the SIM card is activated: Settings - SIM Card Manager - Sim1 Sim2 - Click the SIM card icon - slide to open (the operation mode of different models of mobile phones may be slightly different).

3. If there is still no signal, it is recommended to turn off the phone and take out the SIM card, use an eraser to wipe the SIM card chip, and then reinstall it.

4. If it is invalid, please try to change to another location to rule out whether it is caused by poor signal coverage at the location.

5. Try to change the network mode to 3G or 2G (do not select the auto-connection mode). Note: Some machines do not support changing the network mode.

6. Try to change the SIM card to another one.

If you can't read the SIM card, you can see if it's reversed, or try to reseat it. If it still doesn't work. Contact after-sales, after all, it is still guaranteed, and it is necessary to actively use after-sales service.

Hello dear, I'm asking the blogger, I've seen your question, I'm sorting out the answer, manually typing....I will reply to you within five minutes, and I will definitely ask you questions, because there are many people who need to queue up, so please wait for a while.

Apple 12 doesn't read the card, what's going on, hello, you get Apple after-sales service, you can return to the factory for repair.

Hello. I hope my answer can help you solve the problem, you can ask any more questions if you need anything, and I wish you a happy life.

Questions. But my phone didn't drop or touch, but suddenly I didn't read the card.

This is a problem with the motherboard, not a matter of whether it falls or not.

Questions. So how can the motherboard be broken if it hasn't been dropped or touched?

This is a burn that occurs when the motherboard is running, so it doesn't read the card, and you try someone else's card.

Well,If the Apple 12 can't read the things on the card,Then you can do this.,It's the one you quit him out.,It's okay to shut down and restart, right?

Look at your card slot, is it plugged in? Either it's the other way around, or it's the problem with your ** card.

Summary. There are several main possibilities that cause the iPhone to have no SIM card: 1. The SIM card is installed incorrectly.

There are several main possibilities that cause the iPhone to have no SIM card: 1. The SIM card is installed incorrectly.

2. The iPhone uses the smallest NanoSIM card, which may not be cut well.

3. The SIM card is oxidized.

4. iPhone SIM card slot problems, such as internal rust and poor contact.

Generally, mobile phones do not read cards, just in the following situations.

1.System problems, restore the system, general-settings-restore-reset network settings.

2.Machines with network locks, such as card machines, need to reconfigure the card if the card fails or fails to lock.

3.If the card slot or card is broken, change the card or card slot.

4.The antenna is broken, resulting in the inability to accept the signal, just change the antenna, the antenna is on the motherboard.

5.Baseband problem, baseband is an important element to control signal acceptance, if burned or desoldered, it will lead to failure to accept the signal, do not read the card, etc. Repair of the baseband is required. Repair of baseband includes resetting, moving boards, replacing kits, and so on.

6 has been an Apple mobile phone maintenance engineer, and I know more about these, and the following picture is the motherboard baseband maintenance diagram.

An incorrect SIM card can damage the card tray and card slot or even fail to be removed; 2. Please make sure to use a standard SIM card. Do not use a non-standard SIM card or cut the card by yourself, cutting the card can easily cause the SIM card to be unable to recognize or damage the mobile phone, it is recommended to go to the business hall to change the original standard SIM card; 3. Please confirm whether the card is placed correctly. Whether the notch of the SIM card corresponds to the card slot; 4. Please confirm whether the surface of the SIM card is dirty.

If the SIM card has been used for a long time, you can wipe the surface of the chip with alcohol, or go to the business office to replace the original standard SIM card. If the SIM card is used for a long time, the metal surface is easy to be oxidized, which is easy to cause probabilistic card recognition; 5. Do not plug or unplug the SIM card when the device is turned on. After inserting the SIM card, please restart your phone and try; 6. If the problem still exists, please back up the data in advance and bring the purchase invoice to the after-sales service point for maintenance.

An incorrect SIM card can damage the card tray and card slot or even fail to be removed; 2. Please make sure to use a standard SIM card. Do not use a non-standard SIM card or cut the card by yourself, cutting the card can easily cause the SIM card to be unable to recognize or damage the mobile phone, it is recommended to go to the business hall to change the original standard SIM card; 3. Please confirm whether the card is placed correctly. Whether the notch of the SIM card corresponds to the card slot; 4. Please confirm whether the surface of the SIM card is dirty.

If the SIM card has been used for a long time, you can wipe the surface of the chip with alcohol, or go to the business office to replace the original standard SIM card. If the SIM card is used for a long time, the metal surface is easy to be oxidized, which is easy to cause probabilistic card recognition; 5. Do not plug or unplug the SIM card when the device is turned on. After inserting the SIM card, please restart your phone and try; 6. If the problem still exists, please back up the data in advance and bring the purchase invoice to the after-sales service point for maintenance.

What's the deal with iPhone without a SIM card.

There are several main possibilities that cause the iPhone to have no SIM card:

1. The SIM card is installed incorrectly.

2. The iPhone uses the smallest Nano SIM card, if you are a card clipping user, you may not have cut the card.

3. The SIM card is oxidized.

4. iPhone SIM card slot problems, such as internal rust and poor contact.

5. The hardware or software of the iPhone itself is faulty.

No SIM card solution appears on iPhone.

If it is a new Nano SIM card used, you should first check whether the SIM card is installed correctly and whether it is a problem with the card cutting.

If the iPhone is in use, there is often no SIM card phenomenon for no reason, it is mainly considered from whether the SIM card is oxidized, the card slot or the iPhone itself, and it can be solved from the following aspects.

1. Turn on and off airplane mode to switch.

Try to switch the airplane mode of the iPhone, because the airplane mode is generally turned on, and then turned off, the iPhone will automatically search the network once, and sometimes due to some special circumstances, there is no SIM card, then this problem can generally be fixed.

2. Restart your iPhone and try it.

The previous iPhone was often used well, and there was no SIM card for no reason, and most of them needed to be restarted once or more times to be able to solve it, so when encountering some inexplicable sudden display of no SIM problem, it is recommended to restart it several times to try.

3. Check whether the SIM card is oxidized.

If switching the airplane mode or restarting the iPhone still can't solve the problem of no SIM card, you can use the card pin, take out the SIM card slot, check whether the SIM card installation is shifted, and whether the SIM card metal contact piece is oxidized.

Sometimes, due to a slight shift in the internal position of the SIM card slot or oxidation of the SIM card metal, it is easy to occasionally appear in the scene without a SIM card.

1. Check whether the mobile phone signal in the environment is blocked or the signal is weak; 2. Check whether the mobile phone has "airplane mode" turned on; 3. Restart the phone, press and hold the power button until the "Power Off" and "Restart" icons pop up, and click the "Restart" icon button. 4. Reinsert the SIM card; 5. If it is a SIM card problem, you need to replace it with a new SIM card.

This situation is generally a copycat apple, and it is impossible for general**licensed goods to appear in this situation, it is recommended to go to Apple's official website to check the serial number, or call Apple's customer service ** for verification.

It may be that the Apple mobile phone card is not inserted correctly, and the card of the Apple mobile phone can be reinserted and re-read.