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How to change a sim card in an iphone
Get an iphone sim card opener.
A sim card opener is a small tool with an oblong body and a pointy metal tip. Every iphone package comes with one, but if you managed to lose yours or you no longer have your iphone's box, a simple paper clip is a great substitute.
Insert the opener into the sim tray. Look around the sides of your iphone and you should find a small hole no larger than the tip of a pencil.