Why can t my mobile 3G SIM card connect to the Internet? As the title suggests, thank you

1. Restart your phone (take Huawei phone as an example);

2. Drag down from the top of the screen (or from the bottom to the top) to make sure that "Mobile Data" is on and "WLAN" is off.

3. Go to [Settings] - [More] - [Mobile Network] of the mobile phone, select Card 1 or Card 2 [Access Point Name (APN)], click the menu, and select Reset to Default Settings (whether the traffic fee generated by the CMNET access point is included in **, please refer to the actual opening**);

4. If you still can't access the Internet after setting, it is recommended to change the phone and card for testing.

After the mobile phone is turned on, it is connected to the 3G network, and it will become 2G again after a while

1. The 3G network connection of the mobile phone is faulty;

2. The local 3G network is unstable.

The conditions for a mobile phone to be able to use the 3G network are:

1. Have a 3G or 4G mobile phone card;

2. There are mobile phones that support 3G network;

3. The local 3G network has been covered and stable.

If the above conditions are not met, the mobile phone system will automatically connect to the 2G network.

About mobile 3G

When you use your mobile phone, you will notice that some letters will be displayed next to the signal symbol at the top of the mobile phone screen, such as "G", "E", "H", "T" and "3G". "G" refers to the mobile GPRS network, "E" refers to the mobile EGPRS network, and the mobile phone displays these two symbols, which means that the mobile 2G network is being used; "T" refers to the mobile 3G (TD-SCDMA) network, and "H" refers to the mobile 3G upgraded (HSDPA) network.

These four types of network speed from slow to fast are G next time you encounter a full mobile phone signal, but the network speed is not very fast, to see if the mobile phone is displayed on the "H", "T" or "3G" logo, otherwise you will not be able to enjoy the mobile 3G high-speed network, many times, this situation occurs because the mobile phone does not support the mobile 3G network, only choose the right mobile phone, the network speed can be fast! Therefore, with a mobile number, you have to use a mobile 3G mobile phone to match with the mobile 3G high-speed network, and to buy a mobile phone, it is best to go to the mobile phone store or mobile smartphone boutique in the mobile business hall to buy.

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

1. If you don't restart your phone after upgrading to 4G**, you won't be able to use the Internet function normally;

2. Confirm whether there is a 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 before you can use it;

4. After 3-5 minutes of power off, restart the phone and try again;

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 hall to check whether the USIM card is faulty, or replace the card for testing;

6. If the traffic usage reaches the cap value in the current month, the network will be automatically shut down, it is recommended that you pay attention to the SMS reminder of China Unicom or inquire about the **product description.

If the 3G network can't be connected, it is generally a problem with the network signal, you can take a look!

I'm a mobile company, you can come back to consult me.

(9) Use of access points: automatic.

3.Replace other mobile phones for trial, you can change the mobile phone card to other mobile phones, see if you can access the Internet normally, to determine whether it is a problem with the mobile phone or a problem with the card, if it is a problem with the card, then go to the business hall for testing, if it is a problem with the mobile phone, it may be the network function failure of the mobile phone, and you need to go to the repair point for detection and repair.

Apple? It's Apple's words, settings, general, network, cellular data network, the first fill in 3gnet, and then return, 3G on, cellular data on, data roaming on, ok, remember to me!

I put two cards, one 2G and one 3G, both of which are connected, no matter which one, it is very, very slow, and I can't open a web page for a long time. Actively reply to the post and strive to be able to post on the day.

Switch access points; There is no phone bill, it is best to call customer service to ask.

Possible reasons why the mobile phone cannot use the mobile 3G network:

1. Mobile phones do not support mobile 3G networks.

2. The mobile phone card is a 2G network mobile phone card, and you can go to the business hall to change the mobile phone card.

3. If the location does not have a mobile 3G network covered, you can move to a place that covers the 3G network.

Fourth, if the hardware of the mobile phone is damaged, the repair shop can repair it.

Reason 1: Your mobile phone card is a 2G card, so you can't use the 3G network. You can change to a 3G mobile number, and you're good to go.

2: Your mobile phone card is a 3G card, but in your area, the 3G network is not covered or unstable, which will also make your mobile phone unable to use the 3G network.

First of all, confirm what standard your mobile phone is, WCDMA and EVDO's standard mobile phones cannot use the 3G network. In addition, there is a confirmation that there is no 3G network in your area. Now some areas without 3G network will automatically switch to 2G network.

Conditions under which 4G can be used: in the debate family.

1. The mobile phone supports 4G;

2. The mobile phone card supports 4G.

3. There is 4G network signal coverage locally.

4. Is the 4G switch of the mobile phone turned on?

The solution without 4G is to carry the mountain:

1. The mobile phone may not have updated the mobile network settings, so the mobile phone will update it when you are prompted to update.

2. The mobile phone card is activated for 4G, and 4G is activated**.

3. If there is no 4G network locally or the 4G data signal is poor, then there is no way.

4. Turn on the 4G switch.

The conditions for using the 3G network include the following:

1. The mobile phone model supports 3G network, and if it is not supported, it cannot use 3G network. Annihilation Mountain.

2. There is a 3G signal, and it cannot be used if there is no 3G signal, for example, there is only a 2G signal for renting a bucket.

Expand your knowledge: Mobile 3G:

Network standard: TD-SCDMA (3G), frequency band 1880MHz-1900MHz and 2010MHz-2025MHz.

Mobile is G3, go to the business hall and ask, and then do you support mobile G3 on your phone?

1. The network is unstable, although it looks full, but it has been switching between 2G and 3G networks, so you will always be disconnected. Solution: Call the local 10086 to find out the network signal in your area.

Second, when the mobile 3G wireless network card can not be connected, it is likely to be a problem with the wireless network card. If it is not ZTE and Huawei, consider switching to these two brands.

3. Replace the wireless network card.

If you reach a ** speed of 350K, it will definitely be a network above 3G. Mobile TD-SCDMA (3G standard) is known as the port speed, and it is unlikely that the general port speed is a theoretical value. If you use Mobile's latest LTE network, which claims to be quasi-4G, this network is even more immature and unstable.

If you've been shuttling between several networks, it's a sure thing.