Nokia Lumia 900 may not support T-Mobile 3G after all.
Pocketnow has recently leaked specs for the Lumia 900. Among them is that the Lumia 900 will support the 1700MHz band.
It has concluded that the Lumia 900 will then support UMTS 3G for T-Mobile USA.
On closer inspection, however, this not be the case. You see, AT&T uses AWS for LTE, but not for UMTS.
We will take a look at the HTC Vivid and Samsung Galaxy S II Skyrocket (the only two LTE phone for AT&T at the moment) as examples. Both of these handsets uses the Qualcomm Snapdragon processor.
Both handsets support the 1700 Mhz band for LTE, but not for UMTS and as a result will not work on T-Mobile's UMTS network.
In addition, there has been little evidence that there exist Snapdragon processor that support pentaband.
As a result of this whole investigation and to the dismay of many T-Mobile customers, I have to conclude that the Lumia 900 will likely NOT support T-Mobile 3G.