Java tutorial
//package com.java2s; import java.net.Inet4Address; import java.net.InetAddress; import java.net.NetworkInterface; import java.util.Enumeration; public class Main { public static String getLocalIpBy3G() { try { for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en .hasMoreElements();) { NetworkInterface intf = en.nextElement(); for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress() && inetAddress instanceof Inet4Address) { // if (!inetAddress.isLoopbackAddress() && inetAddress // instanceof Inet6Address) { return inetAddress.getHostAddress().toString(); } } } } catch (Exception e) { e.printStackTrace(); } return null; } }