What if the SIM card cannot be read? What if the SIM card cannot be displayed on the mobile phone?

What if the SIM card cannot be read?

1. Let's talk about one of the simplest reasons. Check whether the SIM card is reversed. If the SIM card is reversed, the phone cannot read the SIM card, then we need to re-insert the SIM card in the correct way

2. Verify if the sim is broken.

If another mobile phone is used normally, put the SIM card on another mobile phone, and check whether the SIM card can be identified. If another mobile phone cannot recognize the SIM card, the SIM card is broken.

3. Verify that the mobile phone is broken.

Take a SIM card that can be normally used in someone else's mobile phone and place it on a mobile phone that cannot recognize the SIM card. If the SIM card is not recognized, it indicates that some parts of the mobile phone are broken, it may be a hardware or software problem. This requires detailed analysis.

4. The sim slot of the mobile phone is loose.

For some people who work in the sales of mobile phone products, sim may often need to be plugged in, which may easily lead to poor contact with sim cards. For this problem, before we mount the sim, you can gently press the metal shrapnel on the SIM card, attach it to the SIM card, and then press it again, or move the SIM card back and forth.

5. The SIM card slot of the mobile phone is broken.

For some SIM card slots with poor quality, if SIM card slots are often plugged in, the SIM card slots may break down, so that we can put the SIM card on a normal mobile phone for identification, other normal mobile phone sim on our mobile phone cannot be identified, so the sim slot may be broken, but it can only be sent for repair, and then further determine the cause

6 SIM oxidized

Basically, the metal will be oxidized, and some sim will also be metallic. If the phone enters the water or the sim is soaked in water, the sim card may be oxidized. In this way, we need to remove the sim card, then, blow a hair dryer, and then use a paper towel or towel to wipe the gray oxides on the SIM card.

7. The card is not cut,Poor contact! You can go to the China Mobile or China Unicom business office to make up the small card!

For iphone, Samsung, HTC, and other mobile phones, small cards may be needed and the cards cannot be inserted. In this way, we need to cut the cards. If the cards are not properly cut, they will also cause poor contact, in this way, you have to go to the China Mobile, China Unicom, or China Telecom Business Office to re-cut the card or re-create a small card.

8 for some Android Flash fans, they often try new rom features, new styles, or new features, but often do flash brush. Sometimes, after some clicks, SIM card cannot be recognized. There are two solutions to this situation:

1. You can identify the SIM refresh before refresh.

2. Report this problem to the creator of the rom. Ask the rom creator to help solve the problem that the SIM card cannot be identified.

What if the SIM card cannot be displayed on the mobile phone?

Shut down and re-start the device. Once the iPhone is restarted, the entire system will be re-initialized to solve the software fault. As a result, the iPhone cannot identify the SIM card fault.

Operation method:

1. Press the "power key" at the top of the phone, and a red power-off slider will appear on the top of the screen. Then, move the arrow to shut down the phone.

2. Press the power key to restart the instance.

2. There is a circular small hole in the SIM slot on the right side of the iPhone, and the SIM card is obtained using a paper clip or a card acquisition tool provided by the iPhone. Then clean and wipe it, and then mount the SIM card into the iPhone, as shown in the figure.

3. If the SIM has been extracted and cleaned, it will still not work. We recommend that you change the SIM card of another user.

If someone else's SIM card can solve the problem, it indicates that it is a SIM problem. Contact the phone carrier to handle it.

4. If someone else's card is replaced, you can try the restoration function provided by the system. In "settings-General-restore" of the iPhone, select "restore all settings", as shown in the figure.

Note: This function is not recommended for jailbroken iPhones. It may cause a system crash and the iPhone cannot enter the system.

5. If none of the above methods solve the problem that the SIM card cannot identify and display, we recommend that you use the iTunes tool to manually restore the latest iOS firmware system.

Note: We strongly recommend that you back up personal data, such as address book and photos, before restoring the firmware system.

6. If you are trying all of the above operations and cannot solve the fault, it may be the iPhone hardware fault. We recommend that you send your mobile phone to the local Apple after-sales service for troubleshooting.

Reminder

Although the above has summarized a lot of solutions to various problems related to mobile phone SIM cards, there may be more ways to solve them. You can add.