Java tutorial
//package com.java2s; import android.content.Context; import android.telephony.TelephonyManager; public class Main { public static Context mContext; public static String getIMSI() { TelephonyManager telephonyManager = (TelephonyManager) mContext.getSystemService(Context.TELEPHONY_SERVICE); if (telephonyManager.getSubscriberId() == null) { return null; } else { return telephonyManager.getSubscriberId(); } } }