Internet Sharing via WIFI

Dear All,

I am having a Dell Inspiron 15R laptop with WIN7. I am having a query related to Internet Sharing via WIFI of this Laptop. It has built in WIFI Radio Adaptor & Intel My WIFI. I am having both broadband & wireless dongle with GSM SIM support for internet connectivity.

When I am connecting my laptop with broadband for internet connection, my laptop can easily share that connection to other WIFI devices (like android phones etc.) through Intell My WIFI by selecting the option "Share My Internet".

But when I am connecting my laptop with the GSM SIM Support dongle for internet connection, At that time when I am selecting the "Share My Internet" option, It is showing the following error --

    "Share My Internet requires connection to the Internet. Please connect to the Internet"

However, my Laptop is well connected to internet via GSM SIM Support dongle & all the other programs who are using internet all are working fine.

Please anyone help me with the reason of this & solution of this if any.

Thnaks.