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Several phone brands rumored to be planning a major shift away from Android
(www.phonearena.com)
This is a most excellent place for technology news and articles.
Already exists. Several iterations are active and work as a daily driver: phone, sms and mobile networking works reliably, apps exist. Just not as many as on Android, and some features are not part of the OS. This is enough for many to declare them "a failure". That and limited hardware support.
Google has coddled us for way too long, and at what price.