It's honestly a smarter idea to roll out LTE on higher band first, because it is able to handle more traffic; the initial rush of LTE subscribers will be better accommodated. It would be a nightmare scenario if they deployed 800 first, only to find that metro areas are clogging up, and thereby negating the whole LTE advantage.
Not mention all the people on Nextel? They can't just kick them off immediately. Plus, people have signed 2year Nextel contracts in the last 6 months, so their end of contract will come shortly before this.
It's not a big deal...
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[21:22] <Shabbypenguin> but the nexus... well its gunna be better than sex