Why does the 4G signal come and go, and what is the reason for the 4G signal of the Apple mobile pho

1. Problem: I also often encountered a good time difference in 4G signals, the data connection came and went, and I didn't move the location, sometimes I couldn't receive text messages in time, and occasionally I couldn't send text messages, and the power consumption was obviously faster.

2. Try: Call ** to mobile customer service, ask me to ask other mobile customers around me, others are normal, and I can't say why, and finally directly limit the network mode to 2G (the standby time is better than the 4G network when it is good and bad but more than 30%), there is no such situation, you need more traffic and fast Internet access to call back to 4G, so it lasted for a few months.

After the "base station measurement" APP query, when the 4G signal is full, 3 or 1 grid switched in the same place, it is not the same base station. One day, I saw that there are three location modes of the mobile phone, there is 1 item that uses GPS, WLAN, Bluetooth, mobile network and other positioning, mobile network positioning: it is to determine the middle position by connecting 3 nearby base stations, and I thought it was a problem with positioning settings, changed only GPS positioning and turned off the positioning, sometimes this is the case when using the 4G network (but only with WiFi, without 4G data and no SMS when it seems to not switch the base station, and the standby time is normal with 2G).

3. Analysis: I guess the priority order of the mobile phone system when connecting to the 4G network is like this, first of all, of course, even the signal is the best, and then if the data is not connected for a few seconds or when the ping is dropped (of course, it is not excluded that there is a pseudo base station or jammer or other interference in the vicinity of the network said in a certain period of time, but it is not very likely), it will switch to the base station with a slightly worse signal, if the data connection is not significantly improved, or after ten seconds and automatically switch back to the base station with the best signal, repeatedly, The 4G signal is also good and time difference, and the network has data or no data. It is possible that other mobile phone systems or baseband chips are optimized better in this area, and of course, it is also possible that a base station is not optimized well enough (it is only within 20 meters around, and other places are normal).

4. Solution: Within this range, you can only continue to limit the network to 2G mode (China Mobile's 2G network is not a problem to scan the code to pay, of course, you can also go to Q or WeChat), and then switch back to 4G mode when you leave this area or want to use the network quickly. Of course, you can also choose to change to another mobile phone, which may completely solve this problem.

If you have an unstable or bad signal on your phone, it is recommended that you:

1.It may be that the signal coverage of your location is poor, and it is recommended that you restart your phone or try it in a different location.

2.Mobile phone connection to Wi-Fi.

Try. If the problem still exists after the above operation, it is recommended that you bring the purchase invoice, three-guarantee voucher and mobile phone to the local service center for testing by the engineer.

First, exclusive causes are ruled out.

The mobile network is set by the operator to set the current network priority connection to 4G 3G 2G, because there is no 4G and 3G network, so the 2G network is displayed.

The mobile phone does not support 4G or does not turn on the 4G switch, and then the local 4G network coverage must be required, and the 4G mobile phone card must be opened, and 4G ** is opened, after meeting the above conditions.

Let's analyze why the 4G network of mobile phones sometimes suddenly converts to 2G, which may be due to the following reasons: because 3G and 4G are built later than 2G, there are fewer sites in most places. 2G uses the 900MHz band, 3G uses the 2000MHz band, and 4G uses the 2600MHz band.

The higher the frequency band, the worse the penetration effect, and the worse the indoor coverage. This also explains why the current 4G network cannot receive the signal in some closed places, because the penetration is not enough, even in the city, the mobile phone that enters the closed environment can only receive the 2G network with the best coverage progress and signal penetration. The capacity and interference of different systems are also different.

The technologies used in the physical layer of 2G and 4G are self-interference technologies, which simply share bandwidth, and the more users, the greater the impact on each other, and the lower the overall capacity of the cell. When the base station finds that the user's signal is poor or the network capacity is insufficient, the network will let the mobile phone reselect or switch to the network frequency band of the low-end standard, which can ensure the overall experience of the high-end system. Another situation is that operators need to protect existing investments and allocate users strategically.

When operators build new 4G networks, they do not immediately want all users to be on 4G, but also want 2G and 3G to be fully utilized. Therefore, some policies will be used to control users to only work on 2G or 3G networks, because some operators have re-deployed the network, if all user resources are placed in the new network, then the previous construction will be wasted, and it will also cause congestion on high-frequency networks, which is not conducive to user experience.

This occurs when you are in one of two situations:

If there is no 4G network or the 4G data signal coverage is poor, you just need to go to a place with a good signal and it will be restored.

If the mobile phone turns off the 4G function by itself (there may be arrears or base station problems), you can call the business hall** to check the balance of the mobile phone card. If it's not card arrears, then you can ask others if it has suddenly become a 2G network.

Extended information: 4G is a combination of 3G and WLAN, and can quickly transmit data, high quality, audio, ** and images. 4G is capable of speeds of more than 100Mbps**, which is 25 times faster than today's home broadband ADSL (4 megabytes) and can meet the requirements of almost all users for wireless services. In addition, 4G can be deployed in places that are not covered by DSL and cable modems before being extended to entire regions.

Obviously, 4G has incomparable advantages.

Normally, 4G does not have full coverage at present, and the network speed is about the same as 3G 2G when there is no 4G signal.

4G mobile phone signal comes and goes, and the possible reasons are as follows:

Mobile networks are susceptible to weather and electromagnetic interference, as well as signal shielding.

The quality of the 4G network is not good enough, the coverage is not large, and there are still some regions and provinces that do not have 4G networks.

In the city center, the 4G signal is much better, and the Internet speed is normal, but in the more remote areas, the 4G network signal is much worse.

In factories, monitoring rooms, trains, and in adverse weather conditions, the 4G network signal is also much worse.

With the construction and development of 4G networks, these conditions will be improved.

4G doesn't work, there are many people who can't even get through with 4G.

There may be the following reasons for not having a 4G network in the case of a normal phone state:

1、.Whether the identity friend can have a 4G network, if others can use it, it means that there is no problem with the current network. If you can't use it, you can contact your local customer service to report the problem

2. Whether the mobile phone card and mobile phone support 4G. You can dial out the mobile phone card and put it in other mobile phones that support 4G for testing, if it can be used, it means that the original mobile phone cannot use 4G signal; If you can't use 4G in other mobile phones, it means that the mobile phone card is not a 4G card, and you need to go to the local business hall to change the card

There are two possibilities.

See if the current location is due to the signal blind spot, the blind spot includes outside the network coverage area, such as workshops, factories, suburbs, rural areas and other places where network communication facilities have not yet been built, as well as urban signal mobile phones are shielded and blocked signal can not be covered, such as office buildings, bar rooms, elevators, underground places, buildings and other places.

Maybe the mobile phone itself has a bad signal reception ability, hardware problems, generally a problem with the power amplifier, it is best to get a regular customer service to overhaul it, if it doesn't work, then there is no way, unless you change the mobile phone.

Mobile phone system file processing problems: Now many people are using smart phones, and then flash, the ROM, in fact, a little carelessness may delete the system file that is vital to the mobile phone signal, I used to flash in a rental house, before flashing the mobile phone can still talk to the Internet normally, but after brushing the machine turned on, I found that I couldn't search the network, I couldn't dial **, and then I brushed a few, I felt that the signal was not as good as before, and finally had to brush back to the original. So flashing the ROM will also cause the phone signal to be completely absent!

Some people say that this has something to do with the mobile phone card, go to the business hall to change a new card (not the kind that changes the number), and determine whether your mobile phone card is a 4G mobile phone card.

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

Check whether the SIM card supports 4G services.

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

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

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

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 have any other questions, you can go to the Apple Enterprise platform to ask customer service.

4G mobile phones need to be equipped with 4G cards, and only within the coverage of 4G signals can there be signals.

Where there is no 4G network coverage, there is no 4G signal. Not to mention 4G, many rural areas don't even have 3G now.

You may be in a 2G network or a 3G network.

If you can't get on the network with cellular mobile data on, it may be due to the following reasons, if the mobile phone is in arrears, the mobile phone operator will stop your mobile phone's Internet service, and at this time, even if the cellular mobile data is on, you can't access the network. Set the APN in the cellular network settings, fill in the cmnet, and then return, you can use it, if it still doesn't work, log out or restart.

Specific steps: 1.Check whether the mobile phone has turned on the data network switch or wifi switch, you can reconnect in another place, and the network delay caused by the network failure of the mobile phone, the mobile phone needs to turn on the network connection function to access the Internet.

2.Use other devices to try whether you can access the Internet through the wifi, call the operator to which the mobile phone card belongs, and ask the customer service to send the relevant data of the Internet access settings and set it according to the prompts.

3.Check whether the mobile phone is in arrears, and the mobile phone in arrears cannot connect to the data network.

4.The network settings are not set up, if you are connected to a wireless network, then you need to check whether the mobile phone wifi password input and the Internet access settings of the wireless router are correct, it is recommended to follow the following methods to see what causes the inability to access the Internet and solve it.