Every mobile phone that uses the GSM standard has a SIM (subscriber identity module) that allows you the customer to have paid access. You’re probably familiar with smart cards already. Think of this as your primer to computer smart cards. I’m going to be skipping over a LOT of widely available but hard to read info just so you get an overview for this post. It does not bear any resemblance to things I have worked on in a professional capacity for any employer. DISCLAIMER: The topic here is personal research.
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