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Probably not the manufacturers you mentioned and I don't think HTC would roll the dice either, but don't forget about the Chinese companies that make smartphones. They have improved dramatically over the past year or so, and I'm sure Huawei or perhaps one of the Chinese contract manufacturing companies like Shenzhen Kakatech or Superdigital Technology would be a possibility. There are also less well known manufacturers like Pantech or Alcatel that might be willing to do so as well. Still, like everyone else, I have doubt that an Ubuntu smartphone can achieve significant market penetration. Even if there was no Android and iOS, I think trying to compete in the consumer market with Microsoft and Samsung Tizen would be a significant challenge.