Start by getting the PDUs (Program Data Unit). From this, extract the information you desire. Search google for code examples to extract and read the data:
final Object[] pdusObj = (Object[]) bundle.get("pdus");
String who = new String();
String what = new String();
for (int i = 0; i < pdusObj.length; i++) {
SmsMessage received = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
who = received.getDisplayOriginatingAddress();
what = received.getDisplayMessageBody();
Toast toast = Toast.makeText(contexto, "Who: " + who + "\n, What: " + what, Toast.LENGTH_LONG);
toast.show();
}