If you're going to give me a thumbs down, at least post something. My question is a real question. Expansys doesn't say what carriers the phones work on. They just sell the phones. And btw, the Lumia 620 really is 2,3,4 and 5 topselling devices at expansys this week,#1 isn't a phone
Depending on where a tower is at in the 4G life cycle, theoretical maximum download speeds range from 21 Mbps – 42 Mbps.
T-Mobile's HSPA+ network operates on the same band as our 3G network, Band IV, which uses 1700 MHz and 2100 MHz frequencies to transmit voice and data services. The 1700 MHz frequency sends information to cell sites and the 2100 MHz frequency receives information.
As with our 3G network, both 1700 MHz frequency and 2100 MHz frequency are required for a device to function. If a device only has one of these frequencies, it cannot use T-Mobile’s 3G and 4G networks.
T-Mobile is switching some 1900 MHz frequency from EDGE to HSPA+. This will allow devices that work on 1900 MHz, such as AT&T devices, to use our 4G network.
Expect a lengthy wait time in your 620 order. It seemed expansys usa underestimated the 620 so they are waiting for more shipment. I ordered the 620 cyan, 5 days already and not ship yet. I have patience.
I heard tmobile and att. I am using it as a replacement for a media player since i already have a phone. The 620 kicks #$%$ as a pmp.