As far as I am aware the N80 is not yet supported on T-Mobile. So you could get a sim free one and use it but it's not officially released as a T-Mobile handset so may not work with all T-Mobile features. I got mine SIM Free from work, and use it on Vodafone. As the N80 is not yet officially avaialble on Voda, Live! does not work. Which is annoying because I cannot download the football highlights. But apart from that I don't use Live! so I can live with it.
Overall the N80 is a very solid handset. It is very compact in size. Slightly thick, but it does incorporate a 3MP camera. In length, closed, it is noticeably shorter than the C600. Start up time is the quickest of any Symbian phone I've used, and a good 10 seconds quicker than the C600.
One of the major complaints about S60 is how slow it can be. After turning the phone on, accessing the menu for the first time there would be a delay of a second or two. You don't get this on the N80. Access is very fast to all features.
The N70 has been the best 3G Symbian handset to date. Those that didn't like it invariably used the Orange version. The 6680 and 6630 were fairly disappointing. But the N80 is head and shoulders above the competition. The N80 is packed with features, WiFi works very well, and is fairly straight forward to set up. The feature I like the best, and a major factor in making the purcahse is the web browser. The new S60 web broswer is so straight forward, and makes navigation a doddle.
You can choose between viewing a whole page, and scrolling around, or zooming out and seeing the whole page on the screen. If you use this view you move a red square around the page with the cursor, and when you are over the section of the page you want to see, just click and zoom in.
Setting the phone up first time round is easy, using the settings wizard found in the menu.
The camera takes really good pictures. I'm not too fussy when it comes to camphone pics, I know if I want top class pics I'd use a tool designed for the job, a top class camera. But for quality point n shoot pictures the N80 does a very good job.
Not so much a review as a quick opinion. I am extremely pleased with the N80, build quality is obvious from the off, the screen is amazingly clear and bright. So far no bugs found. All in all a quality handset.
Below are some screenshots which I've had to resize to fit into the post. You can see how the browser works in a couple of them. But the genuine screenshots are much better qulaity this is just as a taster.