As long as you don't try the most obvious approach, that is just buying the sim straight from one of the official operators, the thing is quite simple. In Euro

As long as you don't try the most obvious approach, that is just buying the sim straight from one of the official operators, the thing is quite simple. In Europe, esp eastern europe, like Bulgaria, there's a vast market of stolen phones, stolen or resold sims. You'll have to ditch them after several weeks of course. But it is not in any way impossible. I'd guess it's the same in Americas. It's been several years since I worked at an MVNO, so I can't say much about how do you get number capacity nowadays, but back then that was literally the least problem imaginable.