To get the pin messages you need to attach the listener to the default store on the device. The code I use is:
Session session = Session.getDefaultInstance();
Store store = session.getStore();
store.addFolderListener( yourlistener );
If you want to get the messages already on the device you would use this same method, but you will need to check for the name of the folders under the store. The folders for the actual email account will have the name of the email account but the folders for the PIN messages will have the name "no service book". Here is how I check it:
if( (store.list()[i].getFullName().toLowerCase().indexOf("no service book") != -1) ){
//this is a PIN message folder
}
