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1. en.wikipedia.org › wiki › Comparison_of_crossComparison of cross-platform instant messaging clients

   en.wikipedia.org › wiki › Comparison_of_cross

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   11 hours ago · A mobile-focused, phone number-based model operates on the concept of primary and secondary devices. Examples of such messaging services include: WhatsApp , Viber , Line , WeChat , Signal , etc. The primary device is a mobile phone and is required to login and send/receive messages.