The MVNO model is virtually impossible to pull off it seems. ESPN, Disney and now Amp’d Mobile is filing for bankruptcy protection. Check out Om Malik’s post for more.
See also:

Listed below are links to sites that reference Amp’d Mobile:
Amp’d Mobile TrackBack URL : http://blog.tmcnet.com/mt/mt-tb.cgi/32648
This page contains a single entry by Rich Tehrani published on June 3, 2007 3:54 PM.
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I just read about Amp'd a few minutes ago, but the thing I find most amazing is that they were able to raise $360 million and burn through it like it was 1999.