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WhatsApp (officially WhatsApp Messenger) is an American instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [13] It allows users to send text, voice messages and video messages, [14] make voice and video calls, and share images, documents, user locations, and other content.
A sender does not have a mobile phone, and they need to send an SMS from a number that they have provided the receiver in advance as a means to activate an account. A sender adopts the default network gateway identifier provided by an online service, in order to send an anonymous sms, rather than specifying a number of their own choosing.
Signal's software is free and open-source. Its mobile clients, desktop client, and server are all published under the AGPL-3.0-only license. [a] [b] [12] [11] [13] [14] The official Android app generally uses the proprietary Google Play Services, although it is designed to be able to work without them
Avoid the frustration of unwanted emails by enabling the option to only receive messages from senders who are in your contact list. If you're expecting messages from a specific sender, be sure to add their email address to Contacts. 1. Click Settings | More Settings. 2. Click Security and privacy tab. 3. Toggle on Block all senders except ...
RCS aims to be a modern successor with newer features while still remaining an open standard for cell networks like SMS [72] and hence would also not be a closed "walled garden" like commercial messaging networks (also known as OTT (over-the-top) services) such as Messenger and WhatsApp.
A direct-to-mobile gateway is a device that has built-in wireless GSM connectivity. It allows SMS text messages to be sent and/or received by email, from Web pages or from other software applications by acquiring a unique identifier from the mobile phone's Subscriber Identity Module, or "SIM card".