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2. Prepaid mobile phone - Wikipedia

   en.wikipedia.org/wiki/Prepaid_mobile_phone

   A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, or prepay, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed or consumed.

3. List of mobile network operators of the Americas - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_network...

   The country has 7.1 million subscribers in total; [65] with 4.76 million people there are about 149 mobile lines for every 100 citizens (149% penetration rate). Until 2011, Instituto Costarricense de Electricidad had a monopoly on wireless communications.

4. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   Two decades of evolution of mobile phones, from a 1992 Motorola DynaTAC 8000X to the 2014 iPhone 6 Plus. A mobile phone, or cell phone, [a] is a portable telephone that allows users to make and receive calls over a radio frequency link while moving within a designated telephone service area, unlike fixed-location phones (landline phones).

5. Smart card - Wikipedia

   en.wikipedia.org/wiki/Smart_card

   However, the usage defined in ISO/IEC 7816-2:1999/Amd 1:2004 may have been superseded by ISO/IEC 7816-2:2007. [101] Contact-type smart cards may have many different contact pad layouts, such as these SIMs. Contact smart cards have a contact area of approximately 1 square centimetre (0.16 sq in), comprising several gold-plated contact pads.