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This lesson talks about how to check the frequency band used

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by the current mobile number card of the mobile phone

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The way to check the frequency band of the Apple mobile phone is to enter *3001#12345#*

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on the dial interface and find the field test item

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After finding this item, the main purpose is to find this service cell option

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That is, the English is the option of serving this sell info

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After finding this option, look for the frequency band to indicate this option, and see the numbers behind it

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For example, the example on the right is this FREQ

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It means frequency, BAND is the frequency band, in d is the English instruction,

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and the translation is the frequency band instruction

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That is, what frequency band is your current mobile phone using?

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For example, the number behind it is B38 if we see 38

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Seeing B38, we can also be sure that it uses a mobile card,

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because the 38 frequency band is the frequency band used by mobile

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This is the frequency band used by the 4G network used by Apple's current number card

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Of course, if your card supports 5G, the 5G frequency band will be displayed here

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With the change of the phone's system, the query interface has changed

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But this English is unchanged, especially the third and fourth English

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This is where we end up finding this option

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Then 4G is sometimes looking for LTE options

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Find these two more under the LTE option

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You can see the frequency band used by the number card of the current mobile phone

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To check the frequency band used by the current number card of the Android phone, you need to install a software

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Download this English software in the software market

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Open the software after installation,

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you can view the specific frequency band used by the number card inserted into each card slot

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This frequency band is different according to your location, it will change

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So, take your current mobile phone to test

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What should we pay attention to here?

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The point is to first observe what kind of card is used in card slot 1 or 2

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For example, the current mobile phone card slot 1 is a China Telecom card

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For the frequency band of the telecom card, look for the BAND item

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It uses frequency band 1, and it uses LTE, which is 4G signal

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In other words, the current telecommunication card, the 4G frequency band he uses is the 1st frequency band.

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In the picture on the right, we take the card slot 1 as an example, which is inserted with a mobile card.

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Then the current frequency band of the mobile card is called BAND41, B 41 frequency band

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This is to assist us to check which frequency bands of the mobile phone can operate normally

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and which frequency bands cannot operate normally when repairing the signal

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Or it is the frequency band that can operate normally and the circuit of the number card we want

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to repair to make a comprehensive judgment of the mutual circuit,

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which is to judge the channel

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That is to say, it plays an auxiliary judgment role in maintenance.

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For example, your current mobile phone shows 1-band 4G, which is normal,

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and the power amplifier of 1-band means that there is no problem with its line.

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There is no problem with the receiving chip that passes through this frequency band,

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and there is no problem with the antenna that it passes through.

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Then there is no problem when we use this frequency band 1,

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so is there a fault in the other frequency bands we need to repair?

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This is an auxiliary function for maintenance

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That's all for this lesson