How to check the Android SIM count

getprop ro.multisim.simslotcount

or

SystemProperties.getInt("ro.multisim.simslotcount", 1) > 1

How to detect Dual SIM using Android shell ?

getprop persist.radio.multisim.config returns "dsds" or "dsda"   on multi sim Samsung devices

source: https://android.googlesource.com/platform/frameworks/base/+/master/telephony/java/com/android/internal/telephony/TelephonyProperties.java


    public static Boolean isDualSimModel() {
        return (Boolean.valueOf("dsds".equals(SystemProperties.get("persist.radio.multisim.config")))                    Boolean.valueOf("dsda".equals(SystemProperties.get("persist.radio.multisim.config"))));
    }

How to get all Android system properties ?

here is the magic command

getprop

How to dump android processes with thread ids and names

Here is the magic command

ps -t -p