said by kg4icg:VZW and AT&T won't be able to roam on any other LTE system because of the 700 mhz band they have. Sprint/Clear's LTE deployment would be in the 2500mhz range while the other 2 would be in the 700 mhz range requiring totally different equipment altogether. By VZW and AT&T doing what they did, they are locked into there own little LTE universe with 10 mhz spacing while Sprint/Clear would be able to 20 mhz spacing in which the could deploy LTE advance equipment.
They'll both be dual-band actually. VZW and ATT on 700mhz/1700mhz, while Clear and the rest of the planet will be at 2.5-2.6ghz...