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It offers an impressive feature set on Windows and Android, but less so for mac OS and i OS devices.
For $89.95 per year you can install Trend Micro security on up to five PCs, Macs, smartphones, or tablets.
Even if your phone is turned off, Whats App will save your messages and display them as soon as you're back online.
There's plenty more (location sharing, contact exchange, message broadcasting) and the app is free for a year, currently $0.99/ year afterwards.
From this account, you can download the appropriate software for the device you're currently using, or send an email with a download link for a different device.