h1. CellularModem

If you are new to modems, or to the hardware and software architecture used in smartphones and tablets, it's a good idea to start from the "freedom-privacy-security-issues article":https://replicant.us/freedom-privacy-security-issues.php .

Once this is done, there are more documentation on various aspects of the Cellular modem, from the protocol to implementations details.

* [[BackupTheEFS]]: The EFS is a partition that contains modem data like the IMEI. If that partition is lost or corrupted, the modem doesn't work anymore, so be sure to backup it.

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