Unlocking The Screen Of An LG Android Smartphone With AT Modem Commands

by Oleg Davydov, CTO, Oxygen Forensics

Modern smartphones are much more than just a device for voice calls. Now they contain a lot of personal data – contact list, communication history, photos, videos, Geo tags etc. Most smartphones can also work as a modem.

Almost every modem is Hayes-compatible which means it supports commands of the AT language developed in 1977 by Hayes. Every model supports some basic set of commands which is defined by the manufacturer. Sometimes this set can be extended and can contain very interesting commands.

Let us study behavior of an LG smartphone. When you connect it to the computer by USB you get access to the modem automatically (pic. 1). What is peculiar for LG is that the modem is available even if the phone’s screen is locked.

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