i have one for my 2100.. it sticks to the back of the batter and has place for two sims while there is a ribbon that leads to a third sim (which is a fake one) and is inserted in the original SIM slot, well since the 2100 is quick its easy to switch on and off and thus swap lines.. dont know if it will fit in the 6630 and how well it will work..
__________________
Are you a symbian guru devotee yet? become one!