Yes and this makes a lot of sense for any network but especially for EE who only have 2x5 of 800.
I have actually posted this several times but what the hell.......
Rural sites will to start with have 1800 and sometimes 800.
It is conceivable though that in the future a mast like mine for example would also get 2600.
My mast although rural, covers a huge area, including about 2 miles of the A38 and half of the medium sized village of South Brent.
If the 1800/800 ever suffered congestion they could bolt 2600 to it to solve the problem.
If a handset can get 2600 it will use that (which is conceivable even some distance away in line of sight), when it loses 2600 it will go 1800 and when it loses that then there's 800.
The point is, most of the close and line of sight phones will use the huge allocation of 2600 and in doing so will greatly reduce the loading on 1800 (thereby increasing 1800 speeds).
1800 will hold on as long as possible and only those "in those really hard to reach places"

will lock onto 800's finite resources.
So as japaul says 2600 is priority 7, this means that even if you were a mile from a 2600 cell with -110dBm, it wouldn't matter if there was a closer 1800 only cell at -90dBm, your phone would (most of the time * ) go for the 2600.
*assuming the 2600 cell you were on wasn't so congested that it threw you off!
Did I get that right Mr paul? Did I??
I hope so otherwise I either haven't understood it or everything I read was crap!
Haha