Why does the vivox9 mobile phone have no signal all the time?

1. There is no signal or the signal is relatively poor, mainly because the signal will be affected by various factors such as terrain, landform, and high-rise buildings in the process of propagation, such as the current location is in a relatively closed place, and the signal may be affected.

2. If the mobile phone signal of other China Unicom users is normal, the following methods can be used to troubleshoot:

Method 1] Turn on airplane mode, then turn off or restart your phone and try again.

Method 2] Test of changing the phone card to change the mobile phone card to the mobile phone of a family member or friend and try again.

Feedback, we will check and deal with it as soon as possible.

You can view the following troubleshooting methods:

1. Please check whether you use metal protective shell, magnetic protective shell, magnetic bracket and other accessories, metal and magnetic materials are easy to interfere with signal reception, it is recommended that you remove the accessories to view.

2. If you are in a closed indoor environment (such as: basement, elevator, etc.), the mobile phone signal may be blocked, resulting in poor signal, you can go to the outdoor environment to check. If you are in a remote area and the signal may be poor, you can determine whether it is the cause of network coverage by using the mobile phone signal of the same operator's network in the vicinity.

3. Check the SIM card and verify the cross-card swap: observe whether there is dirt or oxidation on the metal surface of the SIM card, which can be viewed 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 to another device, or install another SIM card to your mobile phone for comparison and testing to determine whether it is a SIM card failure. If it is a SIM card reason, it is recommended that you go to the operator's office to replace the card.

4. Go to Settings - System Management - Backup and Reset - Reset Network Settings - Select the corresponding SIM card - Reset settings, and then use to view.

5. Customer service center detection and processing, customer service center address: enter vivo official website vivo**app--my--outlet query or vivo official website web version--bottom of the bottom -- service support--service outlet query--select provinces and cities to query the address of the customer service center. It is recommended to contact ** in advance before going to avoid empty running, plan the itinerary reasonably, and travel safely.

Some places have 4G networks, but some places have no signal.

Hello dear! The question you asked has been seen and we will be happy to answer it for you! Sorting out the answer for you, please wait 2 minutes, dear.

Hello dear! We're happy to answer for you! There are generally the following reasons for the sudden lack of signal on vivo mobile phones: 1. The lack of signal on vivo mobile phones may be due to the poor network environment where the current mobile phone is located, and it may be in the signal blind zone or the network signal is screened, so it is recommended to change the network environment to try; 2. The lack of signal on vivo mobile phone may also be the cause of the failure of the mobile phone card, such as the contact between the mobile phone card and the metal contacts of the mobile phone is no longer sufficient, the mobile phone card is damaged, etc., it is recommended to replace the mobile phone card and try to connect to the network again;

This is a state of sleeping to death, and it is a quality problem of the phone itself!

It is likely that the mobile phone signal is affected by many external conditions, such as the electrical appliances at home can absorb electromagnetic waves.

If the electromagnetic waves of the base station are absorbed too much, the signal will be bad!

But it's generally fine, because it's okay to change positions.

In your case, it is likely that there is a problem with the antenna of the phone and you need to fix it.

In your area, the network of filial piety has been adjusted recently.

Maybe there is something wrong with your phone's receiver, sometimes good and sometimes bad

A friend's card is normal on your phone, and it may be normal. To rule out this factor, you can go to the repair point to see.

There are only two situations when the phone has no signal:

The network information is not covered by the state, or the network cannot be covered.

When the network coverage is not good, it is generally in the mountains, basements, elevators, and when there is shielding or signal interference, there will be no signal or a very weak slippery shelter. 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.

Problems with the phone itself.

There may be a problem with your phone's receiver. You need to go to the repair point to have a look.

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