3G mobile phone 4G mobile phone card, the network shows that 3G can be blocked

The signal cannot be shielded, and 3G mobile phones use 4G cards, and only 3G networks can be used. If there is no 3G network in the local area, I will switch to a 2G network.

Unicom cards will not be blocked.

You can't use a 4G network, you need a 4G mobile phone.

The reasons why the 4G mobile phone card is displayed on the mobile phone is 3G are as follows:

I used a 4G phone and a 4G card, because the phone is in an area where there is no 4G network coverage.

The local signal is not good, resulting in automatic adjustment to the 3G 2G network.

The phone is dead, turn it off and restart it to try again.

Check whether the phone is enabled on 4G network, if not, please turn on 4G network.

See if the mobile phone supports this card 4G network, such as 4G mobile phone may only support 3G contact card, change the card or change the mobile phone can be solved.

It is possible that there is a problem with the network parameter setting.

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The differences between a 4G mobile phone card and an ordinary card are:

4G uses a USIM card. USIM is the abbreviation of Universal Subscriber Identity Module, which can be understood as an upgraded version of SIM. Compared with SIM cards, USIM cards have upgraded the algorithm in terms of security and added the card-to-network authentication function, which can effectively prevent hackers from attacking the card.

There is no harm in using 4G cards in ordinary mobile phones, 4G is the fourth generation of communication system, and the communication theoretically reaches 100Mbps transmission, which is much higher than the bandwidth of 2G and 3G networks.

The use effect of mobile 4G cards for ordinary mobile phones is the same as that of ordinary mobile 2G cards and 3G cards, but ordinary mobile phones can only use 2G network access to the Internet, and there is no way to use 4G Internet traffic, so that 4G traffic is wasted, and only 4G mobile phones can use 4G traffic.

Due to regional coverage, if your location is covered by 4G, you can use the 4G network, if there is no coverage, then the 3G and 2G networks will be automatically selected, of course, 3G is the same, depending on the coverage.

4G mobile phone shows 3G network solution:

1. Start the airplane mode on your phone, and after about 10 seconds, check whether it switches to the 4G network.

2. Restart the mobile phone, let the mobile phone signal network and the operator's signal tower rematch the signal, and let the network automatically identify and switch the 4G signal.

3. Contact the operator's customer service to restart and rematch the operator's mobile phone signal transmission system to switch the 4G signal.

4. This region does not support 4G signals, and the switching of 4G signals can be displayed in a different area, which is related to regional support.

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

1] Use China Unicom 4G**.

Or** 4G network function has been enabled;

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

3] The location has a 4G network covering China Unicom;

4] The number card is a USIM card.

You can check whether the above conditions are met, and you can only use the 4G network after you meet them, if you still can't use the 4G network after eliminating them, it is recommended to consult the local Unicom customer service to check whether the base station facilities are faulty.

Because I went abroad, I turned off the cellular network of my mobile phone, and when I returned to China, I found that there was only a 3G signal, and it was useless to restart and reinsert the card, and later found that the 4G signal was not enabled. If it's an iPhone, open "Settings" "Cellular" "Cellular Data Options" "Enable 4G".

It may be the reason of the network, please check specifically, if you confirm that the conditions are met, it may be a problem with the mobile phone settings:

Settings - SIM Card Management - Network Type - Change to 4G or Automatic.

To use a 4G network, you need a 4G card and a 4G mobile phone.

Hello, normal, sometimes, 4G signal may not cover the current area, it can only receive 3G, just like the 3G card advantage display is E network, in short, it can be backward compatible with the signal, not to mention, now 4G is not very mature, even 3G is not covered in our countryside, 3G card can only use E network.

It may be the reason for the network, please check it specifically, if you confirm that the conditions are met, it may be a problem with the mobile phone settings:

Settings - SIM Card Management - Network Type - Change to 4G or Automatic.

To use a 4G network, you need a 4G card and a 4G mobile phone.

The premise of using the 4G network is that there is a 4G mobile phone and 4G mobile phone card that support the mobile phone card network, please check specifically, if you confirm that the conditions are met, it may be a problem with the mobile phone settings: Settings - SIM card management - network type - change to 4G or automatic.

Is your phone 4G? If not, then it's normal, because the 4G card needs a 4G mobile phone.

There is no 4G network in your location.

There is another reason, your mobile phone number is in arrears, restart the phone after recharging the phone bill, and immediately change back to 4G

My card has been used up in 40 areas since last month, and now what's going on with the 3G network?