There's a SIM card slot under my dad's lappy (ThinkPad L412). I have to unscrew and then remove a small cover which reveals the slot. I took out my mom's cell's SIM and inserted it into the lappy and switched it on. Unfortunately nothing happened...no 'new hardware' detected....nothing. Why is it there and what can it be used for? I thought it would enable me to use Airtel internet in the lappy itself without the need of the cell (Nokia 6030 which didn't come with a data cable and I don't think it can be connected to the PC).