Yeah? So What!
Will AT&T and Verizon 4G LTE ever be compatible? - CNET Mobile
I like how she illustrates this by asking:
'How would you like to have to buy a different tv every time you wanted to switch cable providers?'
Since her posting we are even further away from interoperability, beings it is now illegal to unlock your phone - HelloNNNewman posted about that a few days back.