The US mobile market was shaken up last week by reports that Amazon wants to bundle low-cost cellular connectivity into its ever-growing Prime subscriber offering, a move that could intensify price wars in the mass market and diminish the brand relationship between operators and consumers. Amazon said there were no plans “at this time”, and Bloomberg, which reported the story, believes talks are in the early stages. But the idea is an interesting one, that could further deepen Amazon’s relationship with Dish Network. According to sources “familiar with the situation”, who spoke to Bloomberg, Amazon has held preliminary negotiations with all four national US operators – Verizon, AT&T, T-Mobile and new mobile entrant Dish – about a scheme that would…