Samsung Instinct

i doubt it because wimax is new here in the us and they are starting to make devices compatible with it. they r starting with internet type ones... and eventually a cell phone to use with voice

No. Wimax requires different towers. Sprint has rolled out an initial test service in Baltimore and will soon add other cities.
They are looking to do a joint venture or merger with ClearWire as that company has already started building Wi-Max capable towers in other parts of the country.

There are already 16 cities with 4G access, and more already announced and on the way by the end of this year, and on into next year.

The Instinct, Instinct s30, and Instinct HD are only 3G devices, no currently released phone in the U.S. is capable of 4G. The only 4G devices are offered through Sprint and Clearwire. Sprint owns a majority stake in Clearwire (51%).

That is an interesting point. You would think 3G would be in between 2G and 4G, not after.

Looks like you should move to Kileen, they have 3G.