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A phone running Ubuntu could have an appeal. Being able to use it as a general purpose computing device wouldn't be the major part of the appeal. The appeal would be that I buy the phone and that's the end of matters. What runs on it, apart from the phone S/W itself, is my choice, not the vendors. What it reports back to the vendors is my choice (nothing as it happens). Whether Ubuntu and their vendors would be prepared to restrict themselves to that sort of deal remains to be seen.