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2. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   As prepaid services can often be topped up using cash and vouchers, there is no way to trace the payment and thence determine the identity of a prepaid phone user from payment records. While there is no doubt that criminals and terrorists use prepaid SIM cards to help stay anonymous and avoid easy detection, to date there has been no empirical ...

3. SIM Registration Act - Wikipedia

   en.wikipedia.org/wiki/SIM_Registration_Act

   The SIM Registration Act, officially designated as Republic Act No. 11934 and commonly referred to as the SIM card law, is a Philippine law mandating the registration of SIM cards before activation. Under the measure, mobile device users must register their SIM cards, whether prepaid or postpaid. The law was enacted intending to curb ...

4. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

5. Electronic reloading - Wikipedia

   en.wikipedia.org/wiki/Electronic_reloading

   Prepaid phone subscribers can top up their airtime balances via electronic reloading stations. These stations or retailers use a Retailer SIM card to top up prepaid credits on a subscriber's mobile phone. This SIM card functions similarly to commercially available prepaid SIM cards but with additional reloading/top-up functionality.

6. GSM services - Wikipedia

   en.wikipedia.org/wiki/GSM_services

   Every SIM card contains a secret key, called the Ki, which is used to provide authentication and encryption services. This is useful to prevent theft of service, and also to prevent "over the air" snooping of a user's activity. The network does this by utilising the Authentication Center and is accomplished without transmitting the key directly.

7. Why do debit and credit cards have expiration dates? - AOL

   www.aol.com/finance/why-debit-credit-cards...

   Key takeaways. Both credit cards and debit cards have expiration dates, after which they can no longer be used for purchases in-person or online.