But in order to better understand the overall operation of the GSM system, I decided to understand more deeply, so I dismembered my device into this
I used the 2.5mm interface to find three DuPont wires and took black tape.
Then connect with a cp2102 module
The last picture looks so beautiful, I feel like I've seen it before,
Oh! correct! iron Man! !! !! The mk23 iron armor inside! !! !!
Yeah ( •̀ ω •́ )
pretty good looking
Well, back to the topic, I will not re-establish the environment, it is too troublesome . copy and paste
Understand the GSM system, first put out the relevant links, and if you are interested, take a look for yourself.
So the question is, how do you check if your phone is connected to the GSM network?
you can enter the corresponding engineering code in the phone of your mobile phone
as you can see, the network access method, the mobile phone automatically helps us choose GSM / WCDMA, of course, you can also manually switch, you will know the details of the later experiments.
OK, next I will scan SMS messages by setting up OpenBTS
The official wiki indicates that their system is implemented via GSM BTS