The LG VX8300 doesn't have the 1700 band on it. So any flashing done won't add the 1700 band, since it's hardware based, and not software based. I hear that eventually, all phones will have the frequencies software based. I forgot where I read it at, but one manufacturer wants to make the frequencies software based, so that if a new frequency neeRAB to be added, it can be added to an existing phone.
As for phone that currently have the 1700 band are: Samsung Myshot (minus Alltel model, which excludes the 1700 band), Samsung Spex (R210A), UTStarcom CDM-7126, and now the Kyocera Mako S4000. You won't see any Verizon or Sprint phones with 1700 (AWS) due to Verizon not deciding what to use it for (but more than likely will use it for LTE), and Sprint never bid on AWS licenses directly, and is sticking with PCS. Also, Alltel never bid on any AWS licenses, and now with them being bought out, will keep their phone lineup from even having AWS. And for USCC, they're holding off on expansion, and will likely wait until LTE is finalized before they even expand in AWS.