Have you lost or broken your iPhone 4 sim card tray or your iPhone 4S sim card tray. These are replacements which are compatible with the iPhone 4 and also the iPhone 4S and will get you up and running again. Note these models are the stainless steel looking ones, they are not plastic and made of metal. Note that all iPhone’s take Micro Sim’s and these are the type these sim card trays support.
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