What is the reason why the mobile phone suddenly can t connect to the quad G network 50

If you are unable to use the 4G network, we recommend that you do the following:

1.Check whether the SIM card supports 4G services.

2.Whether to select 4G network mode: Settings - Connection - Mobile Network - Network Mode: SIM1, SIM2, 4G, 3G, 2G (Auto Connect) or 3G 2G (Auto Connect).

Note: When two cards are inserted into China Unicom mobile card: 3G or 4G network cannot be used at the same time, if one card is set to 4G 3G 2G (auto-connection) or 3G 2G (auto-connection), then the other card will automatically become 2G network only.

3.Check if your area is covered by 4G networks and try to move to another location.

4.Shut down, restart, or try to change the card.

5.If it doesn't work, it is recommended to back up the data in your phone (contacts, messages, **, etc.) and try to restore factory settings;

If the problem still exists, please bring the purchase invoice, repair card and machine to the service center, and the professional after-sales engineer will help test it.

If you rule out the system problem, it may be that the baseband is broken, and you can further judge it by looking at the mobile phone store.

If the mobile phone is in arrears, just restart it after payment.

It's like the phone is not being rated.

Let's take a look at your phone balance first. If the balance is okay, try to turn off the wifi and re-order. Or restart your phone if you don't want to. Go to the mobile phone store and have a look.

1. If the mobile phone has been shut down in arrears, the mobile phone will turn off the Internet function, unable to connect to 4G, and only retain the function of receiving**. 2. When using the mobile phone in an area with poor signal, it is easy to fail to connect to 4G. For example, in basements, elevators or crowded places, the ability of mobile phones to receive signals in these places will be weakened, so it is recommended to go to an open place with few people to check whether it can be connected to a 4G signal.

3. Open Settings, find Mobile Network, and check if the 4G function is turned off. 4. Click on Mobile Network, turn on the 4G function after entering, and then click on the preferred network type below. 5. In the interface of preferred network mode, set 4G 3G as the first mode, and the 4G network will be preferred for use when selecting the network.

If the mobile phone displays the 4G+ logo, it means that it has received the LTECAT 6 network, and the network speed is four times that of ordinary 4G.

After setting it up, restart it and try it, but you can't try it again in another place, and then you can only consult the manual customer service of China Telecom Mobile Unicom.

If your mobile phone cannot be connected to the 4G network normally, please check the following conditions:

1.After upgrading to 4G**, if you do not restart your phone, you will not be able to use the Internet function normally;

2.Confirm whether there is a network stimulation network, it is recommended that you can use it in a place with a strong signal;

3.Check whether there is still a phone bill in the account, if the balance is insufficient, you need to recharge and match the envy before you can use it;

4.Confirm whether the parameters of the mobile phone have been set;

5.Check whether the USIM card is inserted, if it has been inserted but still cannot be used, it is recommended that you go to the business office to check whether the USIM card is faulty, or replace the card for testing;

6.Check if there is any problem with the phone, it is recommended that you change the phone for testing.

In addition, the conditions for using China Unicom's 4G network include:

1. Use China Unicom 4G** or have opened 4G network function;

2. The mobile terminal supports China Unicom 4G network;

3. The location has coverage of China Unicom 4G network;

4. The number card is a USIM card.

Therefore, you can check whether the above conditions are met, and you can use the Unicom 4G network only after they are met.

If the above situation is not resolved, you can contact your local customer service to deal with it.

It may be your ** network problem, turn on the phone and then turn it off, try it.

The mobile phone signal suddenly changed from 4G to "E", and then it was no longer available on the Internet, why is this?

Answering that the mobile phone can't access the mobile network, let me share with you the way to solve the problem that the mobile phone can't access the mobile network, first check whether the ** card is loose, consult the people around you if there is a problem with the network, if there is the same problem, it may be that the local network is faulty, if there is no problem, set up the mobile phone; Tap [Settings] on your phone, select [Mobile Network], turn on [Data Network], the button turns blue, and tap [Carrier]; Check whether auto-registration is enabled, if not, turn on auto-registration, click [Access Point], and in general, select [China Mobile Internet Settings]; If you don't use much traffic, you can click [China Mobile WAP Settings], or if it doesn't work, change your mobile phone to test, if you still see no service after changing your mobile phone, take the ** card to the nearby business hall for consultation;

The mobile phone can not access the mobile network, let me share with you the way to solve the problem that the mobile phone cannot access the mobile network, first check whether the ** card is loose, consult the people around you if there is a problem with the network, if there is the same problem, it may be that the local network is faulty, if there is no problem, set up the mobile phone; Tap [Settings] on your phone, select [Mobile Network], turn on [Data Network], the button turns blue, and tap [Carrier]; Check whether auto-registration is enabled, if not, turn on auto-registration, click [Access Point], and in general, select [China Mobile Internet Settings]; If you don't use much traffic, you can click [China Mobile WAP Settings], or if it doesn't work, change your mobile phone to test, if you still see no service after changing your mobile phone, take the ** card to the nearby business hall for consultation;

Happy] asked why the mobile phone is normal but can't connect to mobile data, and there is still a living fee to rely on.

Can you tell me.

Have you bought traffic**?