Why is the 4G network not working after the upgrade?

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 cannot use the 4G network of China Unicom, we recommend that you use the following conditions to troubleshoot the 4G network:

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

The mobile terminal supports China Unicom 4G network;

The location has a 4G network covering China Unicom;

The number card is a USIM card, and the ** speed limit is used, and the traffic used in the current month reaches the speed limit threshold, and the speed limit occurs.

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

It is not recommended to update and upgrade! The software was upgraded, but the hardware couldn't keep up.

Based on your description, we recommend that you also use the following conditions to check the use of China Unicom's 4G network:

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 you meet the above strip blade rolling, and you can only use the Unicom 4G network after you meet it.

If you have forgotten your mobile phone number, you can try the following ways to check your phone number:

1.When you dial the caller ID enabled on the machine, your number will be displayed on the screen of the other party's mobile phone;

2.If your number has been stopped, you can call the local 10010 customer service on this machine, and the customer service representative will query it for you;

3.Generally, after receiving the SIM, the mobile phone will be written into the local number, this method depends on the function of the mobile phone stool, such as: Youji travel iphone mobile phone, you can choose "settings" "**" query.

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4G Main and Secondary Cards]:

If your mobile phone cannot access the Internet normally, please check the following conditions:

Check whether you have upgraded to 4G**, it is recommended to restart your phone (if you upgraded to 4G last month, it will take effect this month, and you need to restart your phone before you can surf the Internet normally);

Check whether there is a network, it is recommended that you can use it in a place with a strong signal;

Check whether there is still a credit in the account, if the balance is insufficient, you need to recharge before you can use it;

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

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

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

If your mobile phone reaches the maximum data limit in the current month, the system will automatically disable your data functions such as Internet access, MMS and mobile phone newspaper, and automatically activate it in the next month.

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

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According to the information you provided, both H and H+ belong to the 3G network. If you are a Tencent King Card, Tencent King Card can support the use of China Unicom's 4G network by default, and there is no need to upgrade to a 4G network.

According to the information you provide, if you cannot use the China Unicom 4G network, we recommend that you use the following conditions to troubleshoot the 4G network:

**4G network function has been activated;

The mobile terminal supports China Unicom 4G network;

The location has a 4G network covering China Unicom;

The number card is a USIM card.

Therefore, you can check whether you meet the above conditions, and you can use the China Unicom 4G network only after you meet them. If you are still unable to use the 4G network after the check, it is recommended that you replace the card to test the chain and consult the local Unicom customer service to check whether the base station facilities are dead and blind.

1. According to the information you provide, if you are unable to upgrade to 4G**, it cannot be ruled out that it is due to the following circumstances:

Card type is not supported: USIM card needs to be replaced;

Blacklisted users are not supported: they need to go to the business hall for processing;

Group member users do not support: need to withdraw from the group's business;

There is a family number binding that is not supported: the family relationship needs to be dissolved;

The current contract is not closed: you need to wait for the original contract to end.

The user's reservation service is not supported: it needs to be made after the reservation service takes effect;

Customer number information is incomplete and not supported: you need to go to the business hall to complete the information;

Internet card users, industry application users, and users whose new contracts have not yet taken effect are not supported.

Consolidation user is not supported: You need to log out of the consolidation account;

Convergence service members are not supported: need to withdraw from the convergence service (primary and secondary cards, Wo family, etc.);

Users with abnormal service status are not supported: such as arrears, shutdown and filial piety, recharge period, etc., you need to pay the fee and return to the normal state before you can continue to handle it;

The network access time is less than 6 months (exclusive).

2. If there are restrictions in Yuanyin, you usually need to go to Unicom's own business hall in the place where you belong to cancel the relevant restrictions before you can continue to handle it.

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If you are an old 2G 3G user, the old 2G 3G user cannot convert to 4G ** for the following reasons:

1.Internet card users;

2.Group member users;

3.Users with contract plan limitations;

4.From 0:00 on the last day of each month to 8:00 on the 1st of the following month, old users of 2G and 3G cannot transfer to 4G**.

5.Other special circumstances (such as the number is in arrears, blacklist, etc., the normal use of the hole, the user information is missing, etc.);

6.There are other restrictions that make it impossible to do so.

If this is not the case, it is recommended to contact the Unicom customer service of the place where the number belongs to understand.

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4G Main and Secondary Cards]:

After 2G 3G users activate the 4G network function, they must meet the following conditions before they can use the 4G network normally:

1.Need to turn on and off again;

2.The local area needs to have normal coverage of China Unicom's 4G network;

3.You need to use a mobile phone that supports 4G network and has the 4G network function turned on.

4.The mobile phone card is already a USIM card (you can check whether the "USIM" is printed on the back of the mobile phone card; If it is a "SIM" card, you need to change to a "USIM" card and use the 4G network);

If you meet the above conditions and still can't use it, please change the card for testing.

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