We like the idea of being able to use multiple phone networks or numbers with one cellphone, but we have to wonder whether there's a better way than Supertwinsim, from Guangzhou Better International. The kit includes templates and stickers to help you slice two SIM cards in half and insert them into your phone, allowing you to access two networks. Does it work? It should, though we're not about to try it. However, Better does provide some advice for anyone about to take the chance: "It is pretty safe to cut SIM card. Maybe it is your most worried thing, now I can tell you 'take it easy.'"