Commenters here say that existing WiMAX areas will continue to be supported long enough for existing users, but does this mean that Sprint will not continue to upgrade and expand their coverage area for WiMAX? I just bought a Sprint 4G phone a few weeks ago (coming from AT&T), and the 4G coverage/speed in the Chicago city limits isn't as great as the marketing had led me to believe, but I hoped that it would only get better in time. Now that Sprint is moving to LTE, can I expect that the device will still be supported but that, unfortunately, coverage and speeds won't improve at all for my Motorola Photon 4G?