Subscriber Identity Module (SIM) is a small plastic card with an embedded metallic chip. The integrated circuit on the metallic chip stores digital data which is used by GSM cellphone companies. The chip also stores phone numbers, user identity, location, network authorisation data and contacts. Most cellphones use a mini-SIM card with a dimension of 15mm by 25mm. Some new devices such as iPad and iPhone 4 use the micro-SIM with a smaller dimension of 12mm by 15mm.
- Skill level:
- Moderately Easy
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Things you need
- Plastic ruler
- SIM card
Put the mini-SIM card on a flat surface such as a table top. Make sure the metallic chip is facing up.
Put the plastic ruler adjacent to the SIM card. Measure the dimensions of a micro-SIM card on the mini-SIM card. Mark the dimensions on top of the SIM card. Make sure the metallic chip lies within the marked outline.
Carefully cut the marked outline of the SIM card. The SIM card is now converted into a micro-SIM, which can be used in an iPhone 4.
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