Do you feel that the 4G network signal is very poor, and there is no signal everywhere

The mobile phone signal is controlled by the RF part of the mobile phone, including: antenna, power amplifier, 13MHz crystal, intermediate frequency and some auxiliary resistor-capacitance components. The fault point should be analyzed on a case-by-case basis;

1. The signal is sometimes absent, sometimes full, and sometimes not at all.

2. The signal is not strong, often in 1-3 grids.

Fault point: The antenna, intermediate frequency, and 13MHz crystal are caused by virtual soldering.

3. The standby signal is normal, and the signal will become weaker as soon as it is a dozen.

Point of failure: The amplifier is partially damaged and needs to be replaced.

4. There is no signal at all, showing no service.

Fault point: Antenna, power amplifier, 13MHz crystal or IF are broken and need to be replaced.

You can try to check it yourself: enter the network selection in the network settings and use manual network search to see if you can find China Mobile or China Unicom, if you can find it, then see if the registration is OK. Different phenomena represent different points of failure.

1. There is no signal or the signal is relatively poor, mainly because the signal will be affected by various factors such as terrain, landform, and high-rise buildings in the process of propagation, such as the current location is in a relatively closed place, and the signal may be affected.

2. If the mobile phone signal of other China Unicom users is normal, the following methods can be used to troubleshoot:

Method 1] Turn on airplane mode, then turn off or restart your phone and try again.

Method 2] Test of changing the phone card to change the mobile phone card to the mobile phone of a family member or friend and try again.

1. If there is no signal or the signal is poor when the mobile phone is inserted into the Unicom card, it may be due to other objective conditions. Because the signal will be affected by various factors such as topography, landform, and tall buildings during propagation, if you are in a relatively closed place, the signal will be affected. Here's how to deal with it:

Turn the phone back on and off and try again;

Swap the SIM card to a family member's or friend's phone and try again;

Check whether the signals of other Unicom users around you are normal.

2. If it still cannot be used normally after self-service troubleshooting, it is recommended that you contact the local manual customer service for verification and processing.

Now the 4G network coverage of the three major operators is generally insufficient, China Telecom and Unicom are only trial commercial and have not officially started, and the mobile network coverage is not as good as the previous 2G 3G.

1. The problem of the mobile phone itself, take the smart phone as an example, the signal of the Apple mobile phone has not been as good as the Android mobile phone, this is the impact of the baseband chip on the signal in the mobile phone, the Apple mobile phone iphone12 was used before the non-Qualcomm baseband (most of them are Intel's baseband chips), and the signal quality has always been criticized. In addition to the baseband chip, problems with the antenna of the mobile phone will also affect the signal, and the common faults of the antenna are poor contact or damage, which requires going to the mobile phone repair shop.

2. SIM card failure causes poor signal, SIM card is the mobile phone card provided to you by the operator, if there is a problem with the mobile phone card, the signal will definitely have an impact, light intermittent, weak, heavy no signal. If this is the case, you can go to the operator's office to change the SIM card.

3. The coverage or capacity of the base station is insufficient, resulting in poor mobile phone signal. Although the coverage rate of base stations is very high, it is not excluded that there are some signal blind spots; In some densely populated residential buildings, if there is no suitable room division, it is estimated that there are many signal blind spots simply by relying on the base station, because the reinforced concrete structure of the building has a certain impact on the signal, and it is too dense and difficult to penetrate. In addition, if there are many people in an area, the base station capacity will be insufficient, and if the base station is not expanded, it will also have a certain impact on signal and network use.

4. Weather also has a certain impact on wireless signals. In rainy days, haze days, rain and snow days, the air density will increase, and the penetration of wireless signals will be weakened, so the mobile phone signal will also be affected to a certain extent.

5. The metal mobile phone shell has a very large impact on the wireless signal, and some friends use the metal mobile phone shell in order to highlight their personality, which affects the mobile phone signal. If your phone case is made of metal, you can replace it with a silicone one. This has very little effect on the signal.

Yes, in a city, there may be good connectivity on both sides of the road, but there is no mobile signal.

Maybe the 4G signal coverage in your area is not yet complete.