Why is there no signal, what is the situation of no signal?

According to the information you provide, please change the card to another mobile phone for testing, if it can be used, it is caused by the failure of the mobile phone, if it is still unusable when you change to another mobile phone, please pay attention to whether the surrounding friends who use Unicom have a signal, to understand whether there is a network failure in the area, contact human customer service feedback processing, if the surrounding friends can use Unicom, it is a problem with the SIM card, you can go to the business hall to change the card.

If you are using a Huawei phone and the " " symbol appears on the signal bar of the mobile phone, we recommend that you take the following methods to try to solve the problem:

1.Please make sure that the SIM card is not disabled.

2.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 no signal.

2) The network coverage of operators varies according to different regions, and some areas may have insufficient coverage capacity, resulting in no mobile phone signal.

If your mobile phone has no signal in a specific area, or if your friends use the same carrier** card with a poor signal, it may be caused by poor network quality in your location, and you can return to normal after changing to another place.

3.Please avoid interference from metal or magnetic materials.

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 no signal on the mobile phone.

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

Special configurations of some networks may cause your phone to lose signal, which can be restored after restarting your phone or turning on airplane mode.

5.Please reset your network settings.

6.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 three or four dots in the upper right corner, and select Reset to Default Settings to try.

7.Please remove the SIM card.

1) If your mobile phone card is a manually cut card, it may regret that the signal problem may be caused by non-standard shape and poor contact, it is recommended that you bring your personal ID card to the operator's business hall 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.

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

If your phone still has no signal, please contact Huawei Consumer Service** Biquela (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 nearby Huawei Customer Service Center for testing.

Make an appointment for service. Boarding service.

Repair spare parts** inquiry.

Unicom's mobile phone card shows no service, there may be the following reasons:

1. SIM card.

If the metal contacts with the phone are not in good contact or the battery is loose, it is recommended that you remove the SIM card and reinsert it into the phone.

2. If the SIM card does not match the mobile phone, it is recommended that you put the SIM card into someone else's mobile phone to try it.

Now, if it can be used normally, please bring the repair card and mobile phone to the mobile phone after-sales service provider to test the mobile phone; If you can't use it normally, it is recommended that you bring a valid ID card and SIM card to the Unicom business hall to test the SIM card.

Make a consultation.

1. Network problems or network inability to cover.

When the network coverage is not good, it is generally located in mountainous areas, basements, elevators, and when there is shielding or signal interference, there will be no signal or very weak. In the process of debugging, optimization and maintenance, the network may also cause signal instability, and the general network will return to normal, and the mobile phone signal will return to normal.

2. Problems with the mobile phone itself.

There may be a problem with the receiver and SIM card slot of the phone. You need to go to the repair point to have a look.

Of course, the factor of SIM card corruption cannot be ruled out.