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2. Pegasus (spyware) - Wikipedia

   en.wikipedia.org/wiki/Pegasus_(spyware)

   In 2019, WhatsApp revealed Pegasus had employed a vulnerability in its app to launch zero-click attacks (the spyware would be installed onto a target's phone by calling the target phone; the spyware would be installed even if the call was not answered). [38] Since 2019, Pegasus has come to rely on iPhone iMessage vulnerabilities to deploy spyware.

3. Mobile phone feature - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone_feature

   Key pad of a Nokia 3720. Besides the number keypad and buttons for accepting and declining calls (typically from left to right and coloured green and red respectively), button mobile phones commonly feature two option keys, one to the left and one to the right, and a four-directional D-pad which may feature a center button which acts in resemblance to an "Enter" and "OK" button.

4. Cellular network - Wikipedia

   en.wikipedia.org/wiki/Cellular_network

   The most common example of a cellular network is a mobile phone (cell phone) network. A mobile phone is a portable telephone which receives or makes calls through a cell site (base station) or transmitting tower. Radio waves are used to transfer signals to and from the cell phone.

5. Inmate telephone system - Wikipedia

   en.wikipedia.org/wiki/Inmate_telephone_system

   In order to use an inmate telephone service, inmates must register and provide a list of names and numbers for the people they intend to communicate with. [5] Call limitations vary depending on the prison's house rule, but calls are typically limited to 15 minutes each, and inmates must wait thirty minutes before being allowed to make another call. [6]

6. History of the telephone - Wikipedia

   en.wikipedia.org/wiki/History_of_the_telephone

   This is a combination of a hand-held computer, a cellular phone, a digital camera, and Internet access. One of its features is the touch screen that facilitates the primary interaction for users for most tasks, such as dialing telephone numbers.

7. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   Nohl claimed that he was able to intercept voice and text conversations by impersonating another user to listen to voicemail, make calls, or send text messages using a seven-year-old Motorola cellphone and decryption software available for free online. [32] GSM uses General Packet Radio Service (GPRS) for data transmissions like browsing the ...