![]() Some messaging services that do not solely focus on a mobile-first experience, or enforce SMS authentication, may allow email addresses to be used for sign-up instead. Some messaging services that are not designed for privacy require a unique phone number for sign-up, as a form of identity verification and to prevent users from creating multiple accounts. Needs third-party client Īpp cannot be installed on iPad, iPod touch. Operating system support Operating system support for messaging clients ![]() ![]() Skype Technologies, a subsidiary of Microsoft Corporation May 15, 2013 9 years ago ( ) (as Google Hangouts)
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