Nokia had something pretty similar on Maemo / Meego IIRC. It’s still such a shame they never properly pushed it. Elop was a moron.
1. WhatsApp didn't want to make an official port for Maemo / Meego, for whatever reason.
2. WhatsApp bans your number if it detects that you are using a non-official port.
3. WhatsApp became the essential communication platform.
The unified messaging on N900 was great, but without WhatsApp, I was that weird guy who was still stuck with SMS.
Jolla, with its android app support, fixes that problem for me. Blame Acton, not Elop.