Telecom's primary frequency for their 3G WCDMA (HSDPA) XT network is 850 with 2100 as infill in the cities. So a phone with only 900/2100 HSDPA could be fairly limited on the XT network. You really want one with 850 for the Telecom XT network, if it didn't have 2100 you probably wouldn't notice.
I thought so - for the OP, that would mean limited access as a 2Degrees subscriber.
As you have no 900 hsdpa (only 850) , speed would be limited - unless you are in an area with 2100 spectrum. The imported models have 900/2100
As 2degrees have only just put them in the shop at 749, it kinda rains on their parade a little.... :-)