Card 2 has no service, why can it only be a single generation

Hello! Sorry for the inconvenience, you can try the following first:

1. Click one-key acceleration (one-key cleanup) in the status bar of the mobile phone or enter the program management of the desktop to close the background program and clear the cache file to increase the available memory and avoid the phone crashing when the memory is insufficient.

3. You can go to Settings -> General More Settings -> System Upgrade ->Check for Updates Now-, according to the prompts**Upgrade package, click Verify and Install, the phone will restart and automatically enter the upgrade mode to upgrade your phone's system.

4. Try to clear the abnormal data through "Settings-> General More Settings> Factory Reset->Erase All Data". Note: This item will lose all the data stored on the user's mobile phone, including ** book, short message, third-party application software, and related information, and the data stored on the T card will not be lost.

Use with caution. (Note data backup).

5. Try to upgrade the firmware of your phone.

You can enter.

If you try the above methods and still can't help you solve the problem, it is recommended that you go to the after-sales service center to test your mobile phone, please rest assured that the technicians of the after-sales service center will properly deal with the problems encountered by your mobile phone, you can check the address of the after-sales service center in the settings of the mobile phone - general more settings - after-sales service menu. You can also go to vivo official ** to check the address of the after-sales service center.

vivo mobile phone implements a national warranty, and you can deal with the problems encountered in the use of the mobile phone at any vivo mobile phone after-sales service center in the country.

Is your phone dual-SIM dual-standby? Is it a telecom version of the phone? Some telecom versions of dual SIM dual standby card slots mirror telecom cards and mobile cards respectively, and cannot be inserted incorrectly.

Dear, according to your description, if your phone supports dual SIM, but the second card cannot receive the signal, then it is likely that there are several reasons:1Card slot failure:

It may be that there is a problem with the metal contacts of the second card slot, which prevents it from working properly. If this is the case, it is recommended that you send your phone to a professional repair agency for repair. 2.

Carrier coverage issues: Sometimes, we may be in a place that doesn't support that carrier's coverage, and the second card won't be able to receive the signal. You can confirm this by trying to change your card from a different carrier.

3.SIM card damage: If possible, please put the second card into another mobile phone to test whether there is a signal, if other mobile phones can not find the signal of the card, then it is very likely that there is a problem with the card Zheng Qi itself, it is recommended that you contact the operator's customer service center for more help.

4.Dual SIM settings: The second SIM card cannot be used normally due to the failure to bind the dual SIM or the forest code setting or the setting is incorrect.

Please adjust the relevant settings of the Double Shouting Chunling Card in the settings of your mobile phone.

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

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 that there is no service as the reason for the SIM card.

4. If the SIM card of the mobile phone fails to reconnect to the search network after there is no signal in the network signal coverage area, you can manually search for the network front cover 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.

Hello: According to your description, this may be a problem with your SIM card, we recommend you to rent a trillion to replace other SIM cards to try, if it still can't be used normally, it is recommended that you restore the phone backup data to factory settings (Settings - Reset - Factory Reset), or directly contact the Samsung service center to test the machine. Samsung Service Center Location Query.

1. Check the operator**.

Please check the status of your SIM card** and make sure that the SIM card is not in arrears or cancelled.

2. Confirm whether to use third-party magnetic or metal accessories.

Check whether you use metal protective shells, magnetic protective shells, magnetic brackets and other accessories, metal and magnetic materials are easy to interfere with signal reception, it is recommended that you remove the accessories to view.

3. Check whether the current environment covers the operator's network.

If you are in a closed indoor environment (such as a basement, elevator, etc.), the mobile phone signal may be blocked, resulting in no signal, and you can go to an outdoor environment to check. If you are in a remote area and the carrier network may not be covered, you can determine whether the network coverage is due to the mobile phone signal that uses the same carrier network in the surrounding area.

4. Check the SIM card and perform cross-card verification.

Observe whether there is dirt or oxidation on the metal surface of the SIM card, and check it after cleaning. If you use a tailor-made SIM card, it is recommended to replace it with a standard SIM card. Install the SIM card into other mobile phones that support this card for comparison test, if there is no signal, it is recommended that you consult the operator for processing.

5. Confirm whether the mobile phone supports the corresponding operator's mobile phone card;

6. Reset network settings.

Go to Settings - System Management - Backup & Reset - Reset Network Settings - Select the corresponding SIM card - Reset Settings, and then use View.

Note: Resetting network settings resets Wi-Fi, mobile data, and Bluetooth connection records.

7. Service center testing.

If the above methods fail to solve your problem, please back up your mobile phone data in advance, bring your mobile phone and purchase voucher to vivo customer service center for testing, pay attention to WeChat *** "vivo" or "vivo customer service" to inquire about the service center address**, it is recommended to contact before going to ensure that there is a staff reception before going over, so as to avoid delaying precious time and running in vain.

Hello: According to your description, this may be a problem with your SIM card, we recommend you to change other SIM cards to try, if it still can't work normally, it is recommended that you restore the backup data of your phone to factory settings to view (Settings - Reset - Factory Reset), or contact Samsung service center directly to test the machine. Samsung Service Center Location Query.

If there is no service for card 1 and card 2 on a dual-SIM phone, it is recommended that you:

1.Try to replug the SIM card.

2.Try to change the geolocation.

3.Try to change another SIM card.

4.Back up your data (contacts, messages, **, etc.), factory reset attempt.

If the problem persists, it is recommended that you bring your mobile phone, purchase invoice, and repair card to your local Samsung after-sales service center for testing.

Hello dear Samsung users:

We recommend that you try the following steps:

1.Restart your phone (so that your phone can search and register again)2Under Standby Desktop - Tap Apps - Settings - More - Mobile Networks - Network Operators - Search Networks - Select the network operator supported by your SIM card.

3.Wipe the contact points between the mobile phone card and the mobile phone (whether it is a SIM card with poor contact) 4If the problem still exists, please bring the purchase invoice, repair card and machine to the Samsung service center, and the engineer will check the machine

Samsung knows that we will provide you with high-quality solutions and answer your questions attentively, and hope to get your satisfactory evaluation.

The problem is caused by another card disabled, which can be resolved later by re-enabled. Take Huawei P8 as an example, the steps are as follows:

1. Directly on the desktop of the mobile phone, select Settings to jump.

2. Next, a new window will pop up, and you need to click on the mobile network to enter.

3. If there is no problem at this time, continue to browse SIM card management.

4. In this way, after the relevant buttons are enabled, the requirements can be realized.

All methods have been used, but there is no effect, and it may be related to the design agency.

Dual SIM is not enabled: Some mobile phones will require you to manually turn on the dual SIM function. The first time you use the Dual SIM feature, make sure that the option is enabled.

2.No coverage area: Another common problem is that the SIM card may not have coverage in some areas.

This may be due to the network provider or geographic location. 3.SIM card is not compatible:

Check if the second card is compatible with the device. SIM cards that are not fully compatible can cause network issues. SIM cards with weakened functionality or single connection mode may not support all network modes worldwide.

4.Damaged or Invalid SIM Card: Occasionally, the SIM card may be damaged or become ineffective.

Some phones may have bugs or glitches that may affect the operation of the SIM card. Some of the errors may include SIM card not inserted properly, network failure, etc. If your problem cannot be resolved with a simple workaround, it is recommended to consult your device's user manual for more information, or contact the manufacturer or carrier for detailed answers and support.