Well, our N900 doesn't have 2 or 4 radios to support multiple SIMs simultaneosly... The we can use the virtual SIM to switch between operators. Just do not pre judge the legality of this utility. Consider what would be useful and versatile than the N900 with a software like this. For peace of all the cellular network does not allow two or more lines or numbers, simultaneously. The second line would be blocked and the operator would contact us to approach his office to review the hitorial calls and data.