Session values is not maintained in all the pages using I-mode HTML simulator 2

Hi
I am developing Amazon web service API.I am developing this in mobile . Session maintenance is an important for this project.I can’t maintain session values page by page.If i brows in IE it is working properly but when i test in I-mode HTML simulator it is not working.
So i maintained the session values in the following manner

[code=php]<?php
ini_set(“session.use_trans_sid”,1);
session_start();
?>[/code]

But the session values are passed in the URL.The session id is visible to the user .I think it is not good idea and i dont like to get the values from cookies also .How can i maintain the session using store and retrieving from the file (ie,session.save_path = “c:/wamp/tmp”). This method is working fine in IE and other browser but it is not working in I-mode HTML simulator II.Here is the code i tested

[code=php]<?php
session_start();
?>[/code]

But every time new session id is generated only in simulator but working fine in all other browser

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