#!/bin/bash
echo Shutting down wireless interface[rmnet0]...
netcfg rmnet0 down
sleep 1
echo Bringing up wireless interface[rmnet0]...
netcfg rmnet0 up
sleep 1
echo Obtaining IP Address[rmnet0]...
netcfg rmnet0 dhcp
sleep 3
echo Done...  hopefully all went well and you have a new IP.