I understand what you are looking for, and I think it could be achieved as a tier 2 telco... in the meantime, here's something that might be better than your cu

I understand what you are looking for, and I think it could be achieved as a tier 2 telco... in the meantime, here's something that might be better than your current solution (no affiliation): http://www.worldsim.com/featuresMulti.aspx http://www.worldsim.com/featuresMulti.aspx