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  2. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    Upon installation, it creates a user account using the user's phone number as the username (Jabber ID: [phone number]@s.whatsapp.net). WhatsApp software automatically compares all the phone numbers from the device's address book with its central database of WhatsApp users to automatically add contacts to the user's WhatsApp contact list.

  3. Reception and criticism of WhatsApp security and privacy ...

    en.wikipedia.org/wiki/Reception_and_criticism_of...

    WhatsApp also uses artificial intelligence systems to scan unencrypted data collected from users (profile image and status; phone number, IMEI and OS; names and images of the user's WhatsApp groups; a list of the user's electronic devices [clarification needed]; any Facebook or Instagram accounts) and compares it against suspicious patterns or ...

  4. WeChat - Wikipedia

    en.wikipedia.org/wiki/WeChat

    The company also provides WeChat for Web, a web-based client with messaging and file transfer capabilities. Other functions cannot be used on it, such as the detection of nearby people, or interacting with Moments or Official Accounts. To use the Web-based client, it is necessary to first scan a QR code using the phone app. This means it is not ...

  5. Google Messages - Wikipedia

    en.wikipedia.org/wiki/Google_Messages

    Google Messages [1] (formerly known as Messenger, Android Messages, and Messages) is a text messaging software application developed by Google for its Android and Wear OS mobile operating systems, while it's also available via the Web. Google's official universal messaging platform for the Android ecosystem, Messages employs SMS and Rich ...

  6. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  7. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

  8. Signal (messaging app) - Wikipedia

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

    Signal is an 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 computing architecture ...

  9. List of most-downloaded Google Play applications - Wikipedia

    en.wikipedia.org/wiki/List_of_most-downloaded...

    This is the list of the Google Play apps with more than 500 million, and less than one billion downloads on unique devices: App. Developer. Date Reached [j] Date Published [k] Category. Pre-installed [l] LINE: Calls & Messages [218] Line Corporation.