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I am trying to find network availability using my phone's GSM modem. Last night I had almost done it using following procedure with adb shell connecting phone with Ubuntu laptop.

Terminal 1

./adb shell
su
cat /dev/smd0

Terminal 2

./adb shell
su
echo -e "AT+CIND?\r" > /dev/smd0

In Terminal 1 I had CIND 4 4 1 x x x output and I figured it's 3rd digit which is either 1 or 0 depending on network is available or not. Now today after factory resetting my phone, I can't reproduce this result.

What could be wrong? I have already tried ttySMD0, ttyGS0, ttyUSB0 etc.

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