Where I am, its perfectly legal to purchase a one time sim card. You can walk into the corner store, purchase a prepaid visa (with cash), and buy a sim card (with cash) at the same store. You can then go online, enter the sim card number into the site, add your prepaid visa as payment and whatever details you want. I've done it before and there is no ID verification whatsoever - I literally put in John Smith and it worked... As long as they have payment up front, I guess they don't care. If I'm just using it for one time account verification, I'm not really worried about keeping the sim card long term.