Go to your Debug Engineering screen. Open up your phone dialer, enter ##DEBUG#. Then go to your 1x Engineering menu.
In there you will see Band. If it says CDMA PCS, then you are 1900MHz. If it says Cellular, then you are on 850MHz. I've never seen my EVO LTE on 800 SMR, but I imagine it will say SMR or 800 SMR on band if it is on 800MHz Channel 476.
Robert via Samsung Galaxy S-III 32GB using Forum Runner