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Use an XACTO Knife to cut on the line you traced.

It can be difficult to control the knife when applying enough force to cut through the plastic, so I recommend going lightly for the first couple of times to make a groove. Once you have a properly-shaped groove, go back and apply more force to cut through the plastic. You can also drill 5 pilot holes using a fine drill bit at the vertices. This also helps to guide the knife.

To get a very clean cut you can try heating the tip of the exacto knife with a small lighter torch or even Cigarette Lighter. The hot Exacto blade will easily score into the sim card this way but you may need to heat it several times as it looses heat very quickly.

When you are nearly done, flip the SIM-Card over. You should be able to see the outline of the cutout you made on the top side. For a cleaner result, finish cutting the slot from the bottom side.

Remove the piece you cut out of the SIM.

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