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2. T9 (predictive text) - Wikipedia

   en.wikipedia.org/wiki/T9_(predictive_text)

   T9 (predictive text) Logo of T9. T9 is a predictive text technology for mobile phones (specifically those that contain a 3×4 numeric keypad), originally developed by Tegic Communications, now part of Nuance Communications. T9 stands for Text on 9 keys.[1] T9 was used on phones from Verizon, NEC, Nokia, Samsung Electronics, Siemens, Sony Mobile ...

3. Cellphone surveillance - Wikipedia

   en.wikipedia.org/wiki/Cellphone_surveillance

   Cellphone surveillance. Diagram showing the operation of a StingRay device for cellphone surveillance. Cellphone surveillance (also known as cellphone spying) may involve tracking, bugging, monitoring, eavesdropping, and recording conversations and text messages on mobile phones. [1] It also encompasses the monitoring of people's movements ...

4. Telecommunications device for the deaf - Wikipedia

   en.wikipedia.org/wiki/Telecommunications_device...

   The specific GA and SK keys allow for speedier use of common abbreviations. A telecommunications device for the deaf (TDD) is a teleprinter, an electronic device for text communication over a telephone line, that is designed for use by persons with hearing or speech difficulties. Other names for the device include teletypewriter (TTY ...

5. Multi-tap - Wikipedia

   en.wikipedia.org/wiki/Multi-tap

   Multi-tap. An E.161 standard modern telephone keypad, as used for text messaging. Multi-tap (multi-press) [1] refers to a text entry system for mobile phones. The alphabet is printed under each key (beginning on "2") in a three-letter sequence as follows; ABC under 2 key, DEF under 3 key, etc. Exceptions are the "7" key, which adds a letter ...

6. Signal (software) - Wikipedia

   en.wikipedia.org/wiki/Signal_(software)

   Signal is an open-source, encrypted messaging service for instant messaging, voice calls, and video calls. [ 14 ][ 15 ] The instant messaging function includes sending text, voice notes, images, videos, and other files. [ 16 ] Communication may be one-to-one between users or may involve group messaging. The application uses a centralized ...

7. Data Coding Scheme - Wikipedia

   en.wikipedia.org/wiki/Data_Coding_Scheme

   Data Coding Scheme is a one- octet field in Short Messages (SM) and Cell Broadcast Messages (CB) which carries a basic information how the recipient handset should process the received message. The information includes: the character set or message coding, which determines the encoding of the message user data.

8. Clipper chip - Wikipedia

   en.wikipedia.org/wiki/Clipper_chip

   The Clipper chip was a chipset that was developed and promoted by the United States National Security Agency [1] (NSA) as an encryption device that secured "voice and data messages" [2] with a built-in backdoor that was intended to "allow Federal, State, and local law enforcement officials the ability to decode intercepted voice and data transmissions."

9. IMSI-catcher - Wikipedia

   en.wikipedia.org/wiki/IMSI-catcher

   IMSI-catcher. An international mobile subscriber identity-catcher, or IMSI-catcher, is a telephone eavesdropping device used for intercepting mobile phone traffic and tracking location data of mobile phone users. [1] Essentially a "fake" mobile tower acting between the target mobile phone and the service provider's real towers, it is considered ...