Mobile phone signal, card 1 card 2 have no network

If there is no signal on your phone or an emergency call prompt is displayed on the screen, it is recommended:

2.If it is a dual-SIM phone, please check whether the SIM card is activated: Settings - SIM Manager - SIM1 SIM2 - Click the SIM card icon - slide to turn on (the operation mode may be slightly different for different models of mobile phones).

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

4.If it doesn't work, try to change to another location to rule out whether it is caused by poor signal coverage in your location.

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

6.Try to change another SIM card.

7.Update your phone's system version: Settings - About Phone (About Device) - Manual Update Automatic Update (Software Update System Update - Update). Note: Please back up the data (contacts, messages, **, etc.) in your device before upgrading.

If it is not enough, change the wifi, modern people seem to be inseparable from the wifi, go out to eat to ask the wireless password of the restaurant, and go to a shopping mall to connect the wifi before being willing. But is the network really safe from the outside? At this time, the security of WiFi hotspots is particularly important.

Here's why:

1. It may be that the mobile phone SIM card is not activated, and you need to bring your ID card and mobile phone SIM card to the operator service hall to activate it before you can use it (some operators provide self-service activation of mobile phone APP, Guan Hongfu notes the business hall where the mobile phone card belongs***, select the card number activation function, enter the last 6 digits of the ID card number and the last 7 digits of the SIM card ICCID, upload the ID card** and record the face**, and wait for the system to approve the use).

2. It may be that the mobile phone does not turn on the networking mode, turn off the [Airplane Mode] in the system settings, and wait for a while before the mobile phone can receive the signal normally. If your phone still doesn't have a signal after turning off airplane mode, you might try restarting your phone before using it.

3. It may be that the mobile phone signal baseband is faulty, and the user cannot solve this situation by himself, so he needs to bring the mobile phone to the mobile phone after-sales maintenance center to apply for the replacement of the motherboard or the whole machine.

4. If the mobile phone is in arrears, the operator will turn off the service function of the mobile phone after the arrears, and the mobile phone will be displayed as having no service. In this case, you need to settle the overdue bill and top up a new credit bill.

5. The card slot is loose, and the mobile phone needs to continuously read the SIM card data in the card slot to establish a connection with the base station during the communication process. If the SIM card installed in the card slot is not in good contact due to the shaking of the body, it may cause the mobile phone to fail to read the data normally, resulting in the phenomenon that the SIM card is not serviced.

6. System failure, as we all know, smart phones are divided into two parts: software and hardware, and all functions based on the user interface are completed by software. If there is a bug in the system software related to the baseband chip, it may lead to weak signal and no service in the mobile phone. <>

One SIM card has a signal, and another SIM card has no signal for the possible reasons as follows:

1. If there is no signal, the SIM card is not properly placed in the card slot, if it is, you can reinsert the SIM card again.

Second, if there is no signal, the SIM card is damaged, check whether the golden card area of the SIM card is obviously damaged or scratched. If so, it can only be replaced.

Third, there is no signal that the SIM card is not in good contact, the SIM has been used for a long time or the SIM card is often plugged and unplugged, which will cause poor contact between the card and the mobile phone, at this time, you need to check the electrodes of the SIM and **, if it is not clean, you can use an anti-static cloth to clean it.

Fourth, the mobile phone problem, the mobile phone used is only a dual-open mobile phone instead of a dual-open dual-standby mobile phone, this kind of mobile phone can only choose a SIM standby, and the other SIM card is naturally out of signal, in this case, only to replace a dual-open and double-standby mobile phone.

5. Both SIM cards are telecom cards, and a mobile phone cannot use two telecom cards at the same time, so the only way to do this is to replace one of the telecom cards with the cards of other operators.

The signal display of the mobile phone card is strongly related to the network environment, if you are using a Huawei mobile phone.

When the number of signal grids in the status bar of the mobile phone is more or less, it is recommended that the following methods be taken to try to solve the problem:

1.Make sure you are in a good network environment.

Try changing your current location.

1) In some closed indoor environments, such as houses with dense spacing between buildings, the mobile phone signal may be blocked, resulting in poor signal.

2) The network coverage of operators varies according to different regions, and some areas may have insufficient coverage capacity, resulting in poor mobile phone signals.

If your mobile phone has a poor signal in a specific area, or if your friends use the same carrier** card in your neighborhood, it may be caused by poor network quality in your location.

2.Please avoid exposure to metal or magnetic materials.

interference. If your mobile phone uses a special metal protective case, or you are in an elevator, car and other environments, it is recommended that you remove the mobile phone protective case or leave the elevator, car and other environments, metal and magnetic materials are easy to interfere with the signal, resulting in poor mobile phone signal.

3.Please restart your phone or switch on and off airplane mode.

The special configuration of some networks may cause your mobile phone signal to be unstable, no signal, or poor signal, which can be restored after restarting your phone or turning off the airplane mode.

4.Please reset the APN

Open Settings, enter APN in the search bar at the top, tap Access Point Name (APN) to jump to the mobile data settings interface, tap Access Point Name (APN) again, then tap the three dots in the upper right corner, and select Reset to Default Settings to try.

5.Please reset your network settings.

6.Please remove the SIM card.

1) If your mobile phone card is a manually cut card, it may cause signal problems due to non-standard shape and poor contact, so it is recommended that you bring your personal ID card.

Go to the operator's business office to apply for a standard mobile phone card.

2) Dirty or oxidized SIM cards will also lead to poor contact, so it is recommended that you keep the SIM card clean.

7.Please update your phone system to the latest version.

If your mobile phone still has an unstable signal, no signal, or poor signal, contact Huawei Consumer Service** (950800) for further assistance, or back up your data in advance (third-party apps such as QQ and WeChat need to be backed up separately), bring your purchase voucher, and go to a Huawei Customer Service Center near you for testing.

Repair spare parts** inquiry.

Make an appointment for service. Boarding service.

It may be that the contact on a certain card is not very good, take out the card and wipe it with a paper towel and then put it back, reboot it to try, it should be like this.

If you are using a vivo mobile phone, it is recommended to refer to the following troubleshooting methods: 1. If you are using a Vivo mobile phone, it is recommended to plug in the SIM card or replace it with another SIM card, and cutting the SIM card may cause the SIM card to be damaged and unrecognized; 2. After trying to turn on the airplane mode of the mobile phone, Yinqing did not turn it off again, or changed the network environment; 3. If two telecom cards are used at the same time, the supplementary card (non-data card) must be enabled and enabled for VoLTE service.

Take a look at what the reason is, there will be a mobile phone signal when you install a mobile phone card, whether it is Unicom or mobile, go there and take a look**There is a problem that can be solved.

There are two cards on the phone, and one card has no signal, what should I do? I think you have two cards on the stool rock beam on your phone. If there is a signal on the mobile phone, the two jujube cards will have a signal jujube transport. If there is no signal, there is no signal on both mobile phone cards.