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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.
SMS spoofing is a technology which uses the short message service (SMS), available on most mobile phones and personal digital assistants, to set who the message appears to come from by replacing the originating mobile number (Sender ID) with alphanumeric text. Spoofing has both legitimate uses (setting the company name from which the message is ...
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
Updating Android software is done over GSM where the SIM Toolkit may install automatically with new software regardless of automatic install applications.. Change in applications and menus stored on the SIM is difficult after the customer takes delivery of the SIM and sometimes may be recognized as surveillance software.
Users can schedule messages to send at a particular time or when their conversation partner comes online, [74] as well as choose to send a message "without sound" without a notification. Messages from private chats can be forwarded, with an option to hide the original sender's identity or to hide captions from media messages.
WAP Push was specified on top of Wireless Datagram Protocol (WDP); as such, it can be delivered over any WDP-supported bearer, such as GPRS or SMS. [13] Most GSM networks have a wide range of modified processors, but GPRS activation from the network is not generally supported, so WAP Push messages have to be delivered on top of the SMS bearer.
Sending email to SMS is free for the sender, but the recipient is subject to the standard delivery charges. Only the first 160 characters of an email message can be delivered to a phone, and only 160 characters can be sent from a phone.
Richard Stallman and the Free Software Foundation have been critical of Android and have recommended the usage of alternatives such as Replicant, because drivers and firmware vital for the proper functioning of Android devices are usually proprietary, and because the Google Play Store application can forcibly install or uninstall applications ...