Google Voice Delete

gvoice.js

var voice = {
  jquery: '//ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js',
  key_name: '_rnr_se',
  key_value: function() {return jQuery('input[name="'+ voice.key_name +'"]').val()},
  page: 1,
  messages: [],
  done: false,
  init: function() {
    var script = document.createElement('script'),
    head = document.getElementsByTagName('head')[0];
    script.src = voice.jquery;
    script.onload = script.onreadystatechange = function(){
      if(!voice.done && (!this.readyState || this.readyState === 'loaded' || this.readyState === 'complete')) {
        voice.done = true;
        script.onload = script.onreadystatechange = null;
        head.removeChild(script);
        voice.build();
      }
    };
    head.appendChild(script);
  },
  build: function(url) {
    var count = 0, url = url || '/voice/b/0/inbox/recent/all';
    jQuery.ajax({url: url, data: {page: 'p' + voice.page}, success: function(d) {
      count = 0;
      var result = jQuery.parseJSON(jQuery(d).find('json').text()).messages;
      for(m in result) {
        count++;
        voice.messages.push(m);
      }
    }}).promise().done(function() {
      if(count > 0) {
        voice.page = voice.page + 1;
        voice.build(url);
      } else {
        console.log(voice.messages.length);
      }
    });
  },
  run: function(action,url,id) {
    var key = voice.key_name,
    value = voice.key_value();
    if(action === 'delete') {
      var data = {trash: 1, messages: id};
    } else {
      var data = {messages: id};
    }
    data[key] = value;
    jQuery.ajax({type: 'POST', url: url, data: data});
  },
  delete: function(id) {
    voice.run('delete','/voice/inbox/deleteMessages/',id);
  },
  forever: function(id) {
    voice.run('forever','/voice/inbox/deleteForeverMessages/',id);
  }
};
voice.init();

I am not responsible for whatever harm you may cause by using the scripts described here.

To delete all messages in trash forever:

voice.build('/voice/inbox/recent/trash/');
for(var i in voice.messages) voice.forever(voice.messages[i])

To delete messages and move into trash:

for(var i in voice.messages) voice.delete(voice.messages[i])