Connect a portable USB modem (data card) with Samsung Galaxy S II Is it possible to connect and use portable USB modems such as Reliance net connect, MTS, etc., using an OTG cable with Samsung Galaxy S II and use it?

I went through many forums and haven't got any promising answer. I'm currently using Android version 4.0.3 along with SiyahKernel 3.0. In this kernel, I'm able to connect flash drives, mouse and keyboard.
It's difficult to say with absolute certainty, but generally speaking that is not possible. Some devices can be patched and hacked to include support for this, but I am not aware of one for the Samsung Galaxy S II on any kernel. The flash drive, mouse and keyboard support is built-in to Android whereas USB network dongles need to be hacked on to it. I know it is possible on a number of Nvidia platfoms to connect Huawei USB dongles, but on the Samsung gear, I've never seen a way.

In short, that's not known to be possible on the Samsung Galaxy S II ICS.