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This lesson covers the key knowledge of signal parts such as phone calls, 4G, and 5G circuits

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The first thing to know is the signal part

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The signal here refers to the signal of the phone call and the signal of 4G and 5G,

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which are divided into calls and Internet access.

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Whether it is the frequency band for calling or the frequency band for surfing the Internet,

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this frequency band in the circuit has a receiving channel and a transmitting channel

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The receiving channel and transmitting channel of each frequency band must be normal

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in order to have service and signal

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Then the frequency band of 4G and 5G, no matter which frequency band it is

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It must also have a normal receive channel and a normal transmit channel

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The 4G and 5G signal capabilities are normally displayed on the upper right corner of the phone

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The second item we need to know is that the calling frequency band uses the 2 g frequency band

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When the 2 g frequency band is displayed on the upper right corner of our mobile phone on China

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Mobile and China Unicom, it is the E network

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In fact it also belongs to 2 g, it used to be G network display

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Telecom's 2G is displayed on the upper right corner of the phone's icon, and it shows 1X

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The frequency band used by China Mobile and China Unicom for making calls,

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The frequency band used by China Telecom to make calls is called BC 0,

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and some mobile phones use the B26 frequency band.

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This is the frequency band used for calls

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The third item is the frequency band he uses for 4G Internet access

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China Mobile usually uses high-frequency frequency bands,

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such as mobile frequency band 38 and frequency band 41

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Sometimes when the phone is indoors it will jump to the B8 frequency band

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This is a low-frequency frequency band, and it can also use mobile 4G Internet access

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China Unicom's 4G Internet access is mainly B3, of course,

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it can also use the B1 frequency band to use the 4G network

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Telecom mainly uses B1, it can also use the B3 frequency band for 4G Internet access

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Then China Unicom and Telecom we found that both of them can use the B1 and B3 frequency bands

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for data transmission on the 4G network

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Generally, their rule is that when the signal in the B1 frequency band is weak,

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they will automatically jump to B3 and use the B3 frequency band automatically.

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The above are the frequency bands used by various operators for 4G Internet access

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Mobile 5G usually uses the N79 frequency band

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Then China Unicom and China Telecom usually use N77 and N78.

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Of course, the main one is N78, which uses 5G signals.

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That's all for this lesson