CI Session and Iphone

[eluser]cysquan[/eluser]
Hi guys

I'm running to a strange problem with CI session while trying to run the CI web application on Iphone. As you can see in my attached picture, every times I make a request for an URL on iphone (Ajax or any link), CI creates a new session for that Iphone instead of using the existing one.

I've tried to access the website with android OS phones such as motorola droid and HTC incredible, the session is working fine on these devices

is anyone running to a problem like this? I been searching google for this whole day but still unable to find solution to this...

Thank you in advance for your helps!!! ^^