What full name is Telegram also known by on Wikipedia?

Telegram is also known as Telegram Messenger.

The name distinguishes the modern messaging service from the older meaning of a telegram: a written message transmitted through telegraphy. Wikipedia’s Telegram software article uses Telegram as the main name and identifies Telegram Messenger as an alternative name for the cloud-based, cross-platform service.

Telegram was launched in 2013 by brothers Pavel Durov and Nikolai Durov. Nikolai developed the MTProto protocol, while Pavel provided financial support and helped build the service’s infrastructure. The app began as a mobile messaging platform and expanded to desktop clients, web apps, channels, large groups, file sharing, voice calls and video calls.

Telegram Messenger is not the same thing as a telegram delivery messenger, historically a person employed to deliver telegraph messages. Nor is it a generic name for rival apps such as Viber, WhatsApp or Signal. Those services have their own brands and companies. The phrase also appears in corporate names and older client listings, which can make it seem like a separate application; in this context, it is simply another name for Telegram’s messaging service.