Cut My SIM is available for preorder and supposedly is a mistake-proof way of chopping up your SIM card. As a bonus, the clean cut means that you can change your homemade MicroSIM right back into a regular SIM without taking a messy DIY route. [Cut My Sim]
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Maybe it could double for a decorative punch for scrap-booking. Like Alton Brown says, "Feh on the single-use tools".