Why is there no signal on OPPO A33 after inserting the card?

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.

There is no signal on your phone, so it is recommended that you try it as follows:

1. If conditions permit, please compare whether there is this problem with other models, if there is also a signal coverage that may be poor for the local network operator;

2. Replace the SIM card.

Compare and troubleshoot SIM card failures;

3. In places with more concentration, it will lead to congestion in the use of data networks, and the use environment can be replaced;

4. There is a certain strong magnetic field interference in the local area, which will affect the signal, please change the use position to observe;

5. If the problem still exists, please bring the purchase invoice, warranty card and machine to the OPPO customer service center for testing, and the professional engineer will solve it for you.

If the mobile phone signal is unstable, it is recommended that you try the following methods:

Restart the phone and observe whether it returns to normal;

Try to re-insert or replace the SIM card to troubleshoot the SIM card;

1. The network mode selected by the mobile phone is not covered in the local area, it is recommended to change the network mode (Settings - General - Mobile Network Data Network), choose 2G, or 4G 2G, 4G 3G 2G comparison;

2. Try to re-insert or replace the SIM card to eliminate the SIM card failure.

3. The location of the mobile phone belongs to the area with weak signal coverage or the area with alternate signal coverage, it is recommended to restart the mobile phone and change the location of use;

4. There is strong magnetic field interference in the use environment of the mobile phone, compared with other mobile phones.

If none of the above methods can solve your problem, please bring the purchase invoice, warranty card and mobile phone to the nearest OPPO customer service center for testing and processing.

1. The SIM card of the mobile phone is in poor contact with the shrapnel 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, the mobile phone can be turned off and then restarted, 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 that no service is the reason for the SIM card;

4. If the SIM card of the mobile phone fails to reconnect to search the network after there is no signal in the network signal coverage area, 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. To eliminate external factors, please send your mobile phone to the local OPPO after-sales service center for testing and processing.

If your phone has no signal and the network is unstable, we recommend that you try the following methods:

1. Please confirm whether the system version of the mobile phone has been updated to the latest, and upgrade the system version of the mobile phone to the latest in the mobile phone Settings > About this machine) >Software Update).

2. It is recommended to use the original protective case of the mobile phone, not the metal or gold-plated protective case.

3. If it is in a special area (bus station, high-speed rail station.

basements, elevators), cell phone signal will be affected, and Silly Guy recommends that you try again after leaving such areas for some distance.

4. If SIM card.

Hardware damage can also cause signal abnormalities, so it is recommended that you swap the SIM card to another mobile phone for comparison.

5. If there are problems with other mobile phones in the same area, it can be determined that the operator's network asks the partner, and it is recommended that you feedback the problem to the operator for processing.

If none of the above methods can solve your problem, please bring your mobile phone purchase voucher to your local OPPO customer service center or choose Round-trip.

Free postage repair service to send your mobile phone to a designated service centre for processing.

Hello, there are many reasons why the OPPO mobile phone card has no signal, it may be the reason of the mobile phone reading letter filial piety itself, or it may be that there is a problem with the SIM card of the mobile phone. The specific reasons and solutions are as follows: 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 for activation before you can use it (some operators provide self-service activation of mobile phone APP, take Unicom mobile phone card as an example, pay attention to 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**, Wait for the system to approve before you can use it).

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.

You can try the following operations to find reason 1: take out the mobile phone card, insert it into another mobile phone to see if there is a signal, if there is still none, then the mobile phone card is damaged, and you need to go to the business hall to replace it. 2:

If there is no problem with the mobile phone card, then it may be that the mobile phone card slot is damaged, you can insert another mobile phone card to try to draft, or if there is no signal, you need to repair the mobile phone. 3.The geographical location of the signal is not good, which will also lead to.

If your phone has no signal and the network is unstable, we recommend that you try the following methods:

1. Please confirm whether the system version of the mobile phone has been updated to the latest, and upgrade the system version of the mobile phone to the latest in the mobile phone Settings > About this machine) >Software Update).

2. It is recommended to use the original Baonianyou protective shell of the mobile phone, and do not use the tall metal or gold-plated protective shell.

3. If you are in a special area (bus station, high-speed rail station, basement, elevator), the mobile phone signal will be affected, it is recommended that you leave such an area for a distance and try again.

4. If the SIM card hardware is damaged, it can also cause the signal to be abnormal, it is recommended that you swap the SIM card to other mobile phones for comparison.

5. If there is a problem with other erectors in the same area, it can be determined that it is a network problem of the operator, and it is recommended that you feedback the problem to the operator for processing.

If none of the above methods can solve your problem, please bring your mobile phone purchase voucher to your local OPPO customer service center or choose the two-way free shipping service to send your mobile phone to the designated service center for processing.