[Nokia Lumia 920] abelitin:
Hi,

Well, I am not an expert but here's my two cents:

Quadband vs Pentaband refers to the bands the phone can work on. If you go to the technical specs on the pages you posted, you'll see this:

Network: GSM 850 / 900 / 1800 / 1900; HSDPA 850 / 900 / 1900 / 2100​

...which means that the phone has 4 (hence 'quad') bands in both GSM and HSDPA. In the case of a pentaband HSDPA, it also includes a fifth (and for you very important) band -1700 MHz.

Your last (and most expensive) option should work for sure, since it is a pentaband Rogers-branded model, even though the technical specifications do not mention the 1700 MHz frequency which is one of the two T-Mobile uses (the other one being 2100). But other vendors, including the one I've purchased my 2 Rogers-branded 920s from, do not list this frequency either, since they just take the info from one source and never bother to correct it when wrong.

The other (cheaper) options are most likely the ATT version, which does not have the 1700 MHz band, but technically can be flashed to Rogers and unlock this band (there's lots of info on this forum on how to do it). There's always a risk to brick the phone (render it unusable), but it's minimal. I guess it depends on your risk-management level, whether you feel comfortable enough to save $220 and carry all the process of flashing the phone, or shell out the full amount and have it working out of the box.

There's also the possibility that the cheaper ones do work on your area without flashing, depending on whether T-Mobile has already deployed the 1900 MHz band:

From: http://explore.t-mobile.com/phone-sim-card#faq

Will non-T-Mobile phones without the AWS 1700/2100 band not work on T-Mobile's 3G / 4G network?

A: T-Mobile provides 4G data services nationwide on the AWS 1700/2100 bands, and is in the process of adding service on the PCS 1900 band. Today, phones with both AWS 1700/2100 bands (not just one or the other) work nationwide on T-Mobile’s 4G network. PCS 1900 band phones (sold by AT&T and others) work on the T-Mobile 4G network in cities where 1900 service has been added. Check with your local T-Mobile store or call customer service to learn about the network status in your area.​

You could also buy it from another place, more reasonably priced. This is where I bought my first one in December, and my second one a couple of weeks ago when I lost my first one :( Mind you, I did not buy either online, but actually went to their retail store to get them. Some people tend to think that they have a bad reputation, but my experience has been quite satisfactory (I bought the first one locked for $500, and they sold me the second one unlocked for the same price, virtually unlocking it for free). I do not know if they ship to the US, and if so, how much it costs but you could try contacting them... The downside is that they only have black. Here's the links:

$499: http://canadagsm.ca/NOKIA/Nokia-Lumia-920-Unlocked-Penta-band-lte/

$550: http://canadagsm.ca/NOKIA/Nokia-Lumia-920-LTE-Windows-8-Rogers/

You could buy the locked one and order an unlock code for about $15 on sites like cellunlocker.net

Attached is a pic of the box to show you that it does have the 1700 MHz frequency...

HTH

--

ARG