The Sony Xperia T3 is now available to order in the United States via the Sony Store. The model offered is the D5106 variant, which supports LTE bands 4, 7, 17 and should work on AT&T and T-Mobile. All three colours (black, purple and white) of the handset are in stock for $399.99.
We noticed that Sony is also now offering the LTE version of the Xperia M2 (D2306) for $279.99. It supports the same LTE bands as above and will therefore also work on AT&T and T-Mobile. If you prefer, for the same price you could pick up the Xperia M2 Dual which has dual SIM compatibility but only supports HSPA+ bands. Sony is also offering the HSPA+ single SIM Xperia M2 (D2305) for $229.99.