One of the concessions T-Mobile USA and Sprint have proposed, to persuade the Department of Justice to approve their merger, is to offload Sprint’s Boost Mobile prepaid subsidiary in tandem with an ‘infrastructure MVNO’ deal. That would presumably involve some spectrum and network assets, laying the foundation for a new mobile player to allay the antitrust regulator’s fears of reduced competition. Reports indicate that there are several parties interested in Boost, most of them from the prepaid market (see inset), but the most interesting of the rumoured candidates is Amazon AWS. The webscale giant has been increasingly active in wireless connectivity trials, raising the prospect that it may want to roll out its own network. According to reports by Reuters,…