According to all the news articles, the CDMA model of the iPhone 5 supports a wide array of LTE bands including the 800 mhz one that Sprint plans on using in the future. Can Sprint confirm that it will work on Sprint's 800 mhz LTE when it's switched on? Also, will newer phones support 800 mhz LTE from now on?
Please find below the info about iPhone 5 using Sprint 3G and 4G LTE network supporting
4G LTE network capabilities
Hope this helps